Help me out. Running out of time.?

am so depressed here. I suffer from seasonal depression and it has gradually been getting worse over the last three years. Last winter I was suicidal, but all my parents did was send me to shrink. I'm 15 and my depression has destroyed my life. I used to be an AB student, now I'm failing 9th grade. I used to have friends, now I barely have any. My dad want to move too because college is very expensive in this state. My parents have wanted to move before, but never took any action. They always complain about how snowy and cloudy it is during the winter. My dad even has an opportunity to work anywhere on the east coast. I've told them how I feel, but they won't move. I can't stand to go through 3 more cloudy winters. I will end up killing myself. How can I get them to move?