Why Shouldn't I kill myself?

I'm 15 years old. I'm not what people call the "coolest" kid. I'm not very cute, I'm not very skinny, I'm not very tall, and I don't have very many friends. I'm shy, and believe me I have gotten out there and tried to make friends. I'm just naturally just not likable. I'm always lonely, I never have anyone to talk to or text. I'm bullied everyday at school. I get pushed into the lockers and things thrown at me, and nobody not even one person sticks up for me. Even one guy who said he was my friend laughed and joined in with the bullying. I'm depressed, have OCD, ADD, ADHD, and have a anxiety problem. I've literally cried to many times that it led me to thinking about killing myself everyday. I literally just want to cut myself or hang myself. I have a talent, but people tell me its not going to happen, because nobody will accept me. The past few months, I've been doing bad things, vandalizing peoples houses, smoking, drinking, and trying not to care what people think about me, but it never works. Give me a few good reasons why I shouldn't kill myself.