Don't worry about telling a therapist. Whatever you tell a therapist is confidential - only between you and the therapist. They are bound by law - they can't tell your parents so please try to open up and talk to a therapist. I know it's scary but believe me, they've heard it before and won't be shocked or make you feel ashamed. And having been there myself, I can tell you that it is a relief to tell someone who is trained to be non judgmental about it.

Good luck tomboy. I understand if your Mom won't let you go on PC more often - she probably thinks it's "giving you ideas" or "triggering you to cut". Just update us when you can - we care about you