My mom is being selfish?

My dad pays to mortgages do his house and ours. She always uses his money to go on trips. My dads friends are always coming over his house, she left me over there knowing I thought one of his friends were going to rape me. She used to work at a daycare now she won't work there to support her three children. She always yelling and hurting my feeling. She threatens to take all my stuff away.the only think she does is sleep. I'm always helping her, if I ask her shell say no. I'm so sick of her