I understand, and I know I'm not really good at advice, but I know who this exactly feels. Im really trash at social skills, I never talk to anyone about how I feel, I don't really talk to anyone about anything at all. And I don't know how they would react when I tell my parents exactly what been happening and that I've been self harming a lot, so that makes the issue even worse. One time, I even had to lock myself in a cupboard to stop myself for doing anything further (it was quite big thankfully, I stayed there for about 3 hours)
So if you ever need someone to talk to about anything, I'm here for you, and I'll try and answer as quick as I can,