Im Nervous about tomorow

So, my parents found out about my self harm last Friday and Tomorrow I have to go see the counselor. I've never been to someone in person and told them the kinda stuff I tell people who've been through the same thing online.I just cut my arm 8 times with a pencil sharpener, not even deep enough to draw blood so part of me is incredibly nervous about telling someone about it and what dark stuff I lock in my head on the daily. But the other part of me is convinced she's gonna shut the door in my face an tell me what I've always told myself, that my “sh” isn't that big of a deal since I don't draw blood, just scars and I just have no idea what the hell I'm doing. Help