Why does my brother act in these ways?what the hell is he trying to do to me or prove?

Your brother treats you poorly and you "wonder if he knows it". I would say this is the 1st step in starting to get along with him. Tell him in a calm manner what you dislike about him. Until you do this, he may have no clue as to what you think of him. so start by asking him if he knows how you feel about him and go from there.