Well I did leave the USA, which by your logic only should be occupied by the native indians, but moving to Brazil is just more of the stronger power taking from the less powerful initial occupiers, as it has been throughout history.
Brazil is compensating the natives - just last week the Brazilian "supreme court" ruled that the non-natives who have invaded the reservation to plant rice must leave. The natives in Brazil have exclusive use of many reservations, that total about twice the area of France (for a population less than Paris has).
I doubt that their is any place on earth where the original population is still in control of the land. Your ancestors came into India from the North East, I am pretty sure. Go back their (Southern Turkey, Iran, Afghanestan, etc.) is you feel so strongly about these historic fact. IMHO once a couple of generations have died off, the most the descendents of the original holders of the land have any right to is compensation for what was clearly stolen from them.
Same reason Greece has a right to at least some compensation for the 2000 year treasures in the British Museum, but I do not think a right of return for them now. Hell even the "vestal virgins" supporting the roof of the small temple building near the Parthenon are fakes, put there by the Government of Greece - the real ones are in some air conditioned / pollution free room hidden from view. Where the originals are is not nearly as important as that they are well cared for. -MHO.