How can i handle my brother?

My big brother tells me i am lucky he isn't a douche to me. But i feel so much anger and hurt from him because he easily tells people that I have anger issues and really need counseling. He goes into much more personal things than that also, when speaking to his friends. He tells them very personal things about when i was depressed and all the issues my brother believes I have. He's gone so far as to say to them that Im manic bipolar, even though i am not. The only time i ever feel angry is when im around him. I've asked him to stop and he pretends he doesnt know what i mean. He attacks all i do. How do i cope or deal with this? I have asked my parents for help but they ignore what i say because my brother is the oldest and is the only son. Anything he says or does is forgivable in my family. It is true i get angry alot, but this is when i am around my family. Outside of my home i am a pretty positive person and mellow. I have approached my psych prof. about counseling and she said i seem fine from all her observations of me, we even had a session together and she said i appear emotionally and mentally stable ( i did this because what my brother said got to me). so what the hell? how do i deal with this dude?