My little brother acts hostile but also copies me?

Lately my little brother has been acting very hostile, he really thinks he is the greatest to walk this planet on every surface. But really he isn’t, he also doesn’t really care what my mom says and he doesn’t realize how foolish he often looks doing this.

But on the other hand he has been copying me, wearing the same clothes, even stealing my clothes, sometimes use my music to impress people, but he also sometimes talks like me, especially in discussions or when he wants to sound smart.

Ever since we were young he always needed to be better than me and he still wants to be I guess.

Anyone have any advice because it’s quite hard to live with someone that’s almost constantly hostile

My little brother acts hostile but also copies me?
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