You are not "native American", but an immigrant from Europe.
The native Americans were here first, and you did not pay for the land you or others took from them.
The Native Americans did not own the whole continent. They were various tribes often warring with each other.
The land was conquered by colonists, not “immigrants”. If you are unable to defend your land from foreigners, then you lose it. That is the way of the world.
We will lose our country if we keep letting illegal immigrants in at this rate. Life won’t be any better for Native Americans if and when that happens, I promise you that.