My 13 Year Old Brother Is Stealing From Me To Buy Drugs

My brother is stealing expensive things from me so that he can buy weed. He took my ipod and sold it a while ago. My parents don't believe me. He's dealing too and scouting for dealers. I wanted to believe him so bad when he said he didn't take my things. God, I hate this. I want my family to be normal for once. I wish I wasn't always colored as the crazy one. My mom doesn't believe anything I say because she says I'm bi-polar/depressed and therefore don't know what I'm saying. I'm not insane. I'M NOT INSANE. I don't know what's wrong with him. He's only thirteen and when he lies I just want to accept it so bad. I want him to be loving and sweet but he's not. He never was. He was always thought of as the attractive, cute one but he has been stealing and fighting for as long as I can remember. And now he's taking my things to finance his selfishness. But it's not the loss of my possessions that upsets me the most (even though I worked hard for that money), it's the fact that because I have a problem my parents can use it to deflect his issues. I hate being the crazy kid. I hate it so, so, much.