Hi dearheart ~ I'm so sorry that your Dad seems to want to ignore your problem. I know this hurts. But it just might be that he doesn't have the answer and he doesn't want to admit it.
How about talking to your counselor at school? I know that they are ready and able to talk to you ~ and they ARE qualified to help. I'm sure that if you needed outside help, he/she would see to it that you got that help. Would you be open to talking to them? They DO NOT tell anyone else what you talked about! Please talk to them, ok?
My parents were like your Dad. Neither one of my parents were "there" for us. I guess that's because their parents weren't there for THEM and so they didn't know how to be good parents.
I hope things work out for you sweetie. Please let us know how you're doing after you've talked to someone, ok? We do care. Hugs, Lee