Child abuse?

I feel really dumb asking about this but I'm 15 soon to be 16 and I did something stupid. I gave myself a tattoo. (Which I love and don't regret at all) I told my mom about it two weeks ago and she shrugged it off but today she found it and lost her mind. She rightfully took all my electronics and I sat around and let things cool down a bit. I started watching a movie with her and she randomly got mad and pulled my hair. Hard. And she stood up calling me dumb and retarded while kicking my shins. 
She also goes on rants 24/7 about how horrible my dad is for leaving. And how she can't find work, all of her life problems she screams at me. Most of which she will blame me for. If I show any signs Or try to speak about my depression she says I'm trying to steal attention from her. 
Would this be child abuse and do I say something? Who would I tell? What should I expect if I told someone about this stuff?