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For aliens to even GET here requires a much higher level of technology than we currently possess And it's not just FTL, it's things like battery life, computer power, artificial gravity, radiation shielding, perfect water storage and recycling
If you want humans as aliens, go watch Avatar or that one episode of The Twilight Zone.
Witty closing remarks have been replaced by massive head trauma and severe hemorrhaging.

What if they were on a similar level to us only they had other technology like hibernation machines to keep them alive over very long periods of time.
In Defiance the aliens build massive Arks with what look like freezing tubes to keep their population alive for a 5000 year trip to Earth. No FTL and that's how they did it.

"Columbus discovering America" ? - must have been taught in an American school.

I believe defence contingencies have considered an alien intelligence preparing an invasion of Earth by using a 'relativistic' weapon, for example a small block of armour plate travelling at near-light speed, which would be necessary to traverse the distance conventionally. After impact they wait a few decades for the dust to settle. Of course a comet at 17,000 mph would have a similar effect.

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I think the first clue that they're more advanced than us is they found earth before we found their planet. Ding ding ding!

We have a lot of these 'aliens invade earth' films with massive ships, impenetrable shields and death rays that incinerate everything in its path. Does it never occur that we could be those aliens in the future. Much like Columbus discovering America?
Many Native American civilizations were more 'advanced' than those found in Africa. Yet Africa was not colinised to the same extent.
As a previous poster mentioned, a large portion of the indigenous inhabitants were vulnerable to european disease.
And it was that rather than some thinly veiled bigoted assumption that they were slaughtered because of 'primitiveness', led to their decline in numbers.

IF we ever become technologically advanced enough for space travel we will be the genocidal aliens. It is what is destined to happen. Logically when you advance to the point of being several leaps beyond the other creatures around you, you will eventually view the other creatures as we currently view cows or horses we might enjoy them as pets or we might harvest them for food Same logic applies to any alien race capable of space travel, we as humans might be viewed as pets or might be viewed as cattle not sure what other options you might envision with an alien landing party on Earth, maybe they land and some cajuns with the munchies decide to cook'm and eat'm?

If we were more advanced then you wouldn't have a movie. How would they get to our planet since we haven't figured out space travel yet as a species.

Because if they managed to get to Earth they have better technology.

to invade a planet you need technology that's far more advanced that what we have. How to realize this? We've never invaded a planet

that is the whole point - we are the inferior race/species because of the fact that these aliens coming from another galaxy altogether are the ones invading us. And one of the most obvious reason is that they have a higher degree of advanced technology, hence the reason for them to be able to come to earth and invade it.

The OP's question in the title doesn't reflect what he's posing in the actual post. He's asking, why is it always that we're the inferior race that's being invaded, rather than humans invading other planets. As answered quite well by several posts down the chain (about once every week or so), there are plenty of SciFi films where humans are the invaders, and aliens are primitive.

they're always more advanced because they came from a planet or galaxy far far away. Outside of our milky way galaxy and solar system. Of course they have to be far more advanced to be able to reach Earth. When we get far more advanced, I'm sure we will start invading other planets. That hasn't really come yet, has it?
I really don't see what your question is all about. You wouldn't expect aliens to invade in little rickety boats and have spears and loin cloths, now would you?

A race capable of invading another planet is, by definition, more advanced than us.
Being invaded by our own future is an intriguing thought, but it's hard to imagine why future humans would want to exterminate earlier humans. If you want to wipe out your own species, why go into the past to do it? Just blow up the planet in the present

Not all aliens are more advanced than us, just the ones who have conquered interstellar travel. Those who haven't aren't able to reach us.

Has anyone ever seen the old SNL skit where we get invaded by the alien equivalent of British Redcoats?
Might have been Belucci era or soon after.
They even muse about where these dorks got an interstellar spaceship.

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By sheer virtue of the fact that they can bridge the gap between stars. Something that we're still quite some way from.
Does it never occur that we could be those aliens in the future. Much like Columbus discovering America?
Say what?!?!
Any thoughts on humans being the genocidal aliens?
Go watch Starship Troopers
Prof. Farnsworth: Oh. A lesson in not changing history from Mr. I'm-My-Own-Grandpa!

Another possibility - civilisations decline and fall, technologies are lost and rediscovered. We are still not entirely sure how the Egyptians built the Pyramids with the technology available at the time, or how the ancient Britons moved the blocks of Stonehenge 200 miles from the quarry science tells us they came from. I'm not saying aliens did it, I'm just pointing out our own civilisation lost that particular technology and arguably never rediscovered it.
It's already been established that even at light speed, it would take a substantial amount of time to get here from any but the closest star systems, so any alien civilisations reaching us realistically travelling significantly slower than light and a far greater distance would have been travelling for generations. Maybe hundreds of generations, maybe thousands.
Perhaps, like pyramids, their civilisation was once advanced enough to design and build faster than light starships and send them on their way, but the civilisation collapsed at some point during the journey. If they remember where they came from at all maybe it is just as a myth or a legend, with their data records corrupted and any written records being recorded in a 1000 year old language no-one understands any more.
Maybe you would have a fleet of starships arriving each one having evolved independently, so you end up having primitive aliens warring with each other, unaware they come from the same place, with the more advanced Earthlings watching on in bemusement?

Oh kitchenwannabe (better stay there) if I ram a knife in you physics will tell you that you can have a nuke and it will matter not while you squeal with your last breath "i haz nukes".
The fact that our little aliens are using impossible technologies from a physical point in nearly every movie is lost on your feeble mind that wouldn't even be used as a toilet dispenser in an alien ship.
English is not my mother language and I am very certain that your lower intellect isn't able to reproduce a "hello" in the two other languages I can speak.

A nice line in strawman and ad hominem fallacies you've drawn there, with a dose of petulant and infantile sarcasm thrown in..
Not to forget that the weapon technologies alone in different countries of the world developed totally different (history too!), but what am I saying.
Until you get to the application of physics in weaponary. They may use a different concept to describe e=mc^2 but mass-energy equivalence still holds for them as much as it does us, or they wouldn't function in this universe. Whether you use bamboo spears of mass-drivers, ballistics are ballistics, energy is energy, and evolution is moot - Physics is more fundamental than biology. The fact they can travel interstellar medium necessitates a far more advanced level of physics. Too bad you can't understand this through your sad attempt to belittle me.
And I think the word you were fumbling for was omniscience, rather than omnipotence.

Oh beep another brainiac who thinks his view is everything.
So of course the aliens have to feel, think and develop like we do.
Ohhh how could I think differentwait there was some wordI think it was "alien"?
Nah that is just my imagination.
They HAVE TO EVOLVE just like us. Gnihihi. Yeah.
Not to forget that the weapon technologies alone in different countries of the world developed totally different (history too!), but what am I saying.
I bow down to your omnipotence.
Babylon 5! LMAO!