What on earth am I?
Flatness (specifically, a flat Earth)
I do not get around much, but I am heavily debated,
The theory of a flat Earth isn't very popular, but adherents are known for vehemently defending it. (Also, a pun on around.)
You might see me with your naked eyes, but my shadow exposes my disguise,
The Earth appears flat from the perspective of just looking around on the ground, however the Earth's shadow against the Moon reveals that it is curved.
The further away from me you are, the less I seem real,
The higher up you travel, the clearer the curvature is (first the horizon, then the view from outer space)
Your attraction towards me depends on where you are from, but it does not seem to matter a great deal,
I haven't been able to find a source suggesting that people from certain places tend to believe in a flat Earth, but the word attraction in this clue makes me wonder if this has to do with gravity.
Even the others around me in the room make me out to be different from what I claim to be.
No idea... it's a stretch but artificial satellites ("around [the Earth] in the room") make the Earth out to be round?
OP's explanations:
What on earth am I?
Flat Earth (theory).
The "earth" in the title was a small hint
I do not get around much, but I am heavily debated,
You might see me with your naked eyes, but my shadow exposes my disguise,
Although the Earth's shadow on the moon indeed exposes a flaw in Flat Earth theory, the implied reference was about different shadows at different times of the day. Video explanation.
The further away from me you are, the less I seem real,
Your attraction towards me depends on where you are from, but it does not seem to matter a great deal,
If the earth was flat, the center of gravity would be in the middle. So if you lived away from the center of the Earth gravity would pull you towards the center (sideways). But since this is not the case, living in different places does not seem to matter a great deal. Video explanation
Even the others around me in the room make me out to be different from what I claim to be.
Here, room is another word for space. And the others are other planets. If all the other planets are spheres, but the Earth is not, that would make no cosmological sense and would make everything go out of balance.