You should sit and talk to your school counselor about what you are dealing with. What you are describing is abuse. What you could try to do is find some after school activities you could do so you are not home as much too. Join some after school clubs etc.

I am sorry your mother is abusive towards you. Please know that there is something wrong with her and it's not your fault and you ARE worth more than she is saying to you. It's unfortunate, but we can't pick our parents and some parents are very dysfunctional. All the more reason to continue doing well in school, get an education so you can get away from her. It's hard right now at 14, but do your best to reach out for help, there should be a counselor at school you can sit and talk to.

If your mother is the sole provider, that's a lot of stress and she is probably unhappy about this and is taking that out on you.

Doesn't your father work?