You are you and not me because I am me and you are you. The distinction exists because it is impossible for it not to when individuals are involved. Why aren't you someone else? Because you are you, and whether or not you were someone else, you would still be you and not someone else, since "you" are whoever you are. You are you because you are you. You are the way you are because you were born and have grown the way you have. If that had been different, you would still be you, just different from the you you are now. A=A.
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This man right here. *Pats on the back*