Well, I was once a girl and am now an old lady. But I sure feel for you and want you to know there is help. A doctor, as suggested, might be a good start as are CBT programs such as Sam Obitz, Claire Weekes, David Burns, Lucinda Bassett. Believe you can do some programs online.
There is hope, there are possibilities, you'll get better, and there is support here. We are here for you.