What should I do if my mom verbally abuses and beats me from time to time but it's mostly just hair pulling and i have no evidence?

I'm really scared to do anything and this has kind of always been a problem for me. I've gone through seven years of depression and even though she tried to make up for it kind of and it doesn't happen as much anymore my thoughts make me want to tell someone.😲I have a loving Bf now and a really cool arts program I'm going to but i fear losing that if i ever tell. On the other hand, my grades r going down the toilet and I'm drowning in depressing thoughts. I'm already 14, should I just wait till I'm 18?

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