<human>: He is 15 and I'm 17 however I don't plan to move out until after college (so about another 4 years). He is also physcially stronger than me and has repeatly beat me up what feels like just to show dominance. He also gets very defensive so if he hears someone talking about him he barges into the conversation, one time he was in another room and must have been 2 seconds he was already in the middle asking what we were talking about.

My parents aren't much help either with my dad saying it's normal for boys to fight (but I think my brother takes it too far) and my mom has given up on him because he is extremely defiant to her.

Can you summarize the given text in a few sentences?
<bot>: little brother is extremely defiant and likes to exert dominance over me and I tired of it. I'd like tips or ideas on how to stop it, even though I think it might be too late.