HELP!! School's starting on monday and I need advice!!!!

I'm not sure if anyone saw my last post but I've been pulling my hair A LOT since this summer and school's starting next monday.
I feel so out of control.
I would manage to not pull for an hour but after that, I'm hopeless.
I really don't want to be pulling my hair out during class because I don't want anyone to notice that I'm doing it.
I'm ashamed that I do this but at the same time, I want to tell someone (a school counselor maybe if they don't tell my parents..)

My parents don't know I'm doing this. They think I'm just scratching my head because I have eczema and they just tell me to stop. I really don't want them to know I'm doing this but I know I need help.

I feel like it's going to get worse over the school year because I think I pull my hair whenever I think about school(hard classes, homework, AP tests, projects, GRADES) I used to think I was pulling because I wanted attention but I know that's not true anymore.

Can someone please give me advice on how to stop pulling for a long period of time? How can I stop thinking about school? And should I tell a counselor at school???

~maria