hello alicia i went through a situation very similar to this, my mom had a boyfriend who was an abusive alcholic and he liked to put his hands on me, i started to get sick of it and i was very cold to both of them , i did not understand why my mom would allow him to treat me that way. Sometimes are parents dont grow up when they are supose to, they act like children when they should act like parents. my mom was always choosing her boyfriends over me. one day she will wake up and see what really matters and when she dose she will feel like crap for treating you this way, and if she dose not you dont need her, find a person who is nice to you and look up to her like a mother figure.
everything will be ok, just ask god to protect you and change your mothers heart because he is the only 1 who can.
tonyia