When my twin daughters were about 15, they came to me with written letters about how they were feeling with severe depression, and that they needed help. I immediately got them in to see a psychiatrist. If you are more comfortable writing it, maybe that would help. Of course you need to be there too, not just give them the letter. Hopefully they will react better than you are thinking. I had no idea my daughters were feeling that way - maybe your parents have no idea as well. You have to try. If they really won't help, do you have a grandparent who could speak to them? If not, I'm sure someone will help you find an organization that can help. Don't give up - you are very young and have your whole life in front of you. You just need some help getting through this part.