What you think I should do

I'm 19 year old living with my mother and father and an older sister here my problem I'm paying for my loan for school but my mother want me to pay rent .. I have no problem with paying it just  she want me to pay rent and help her with pay for food or whatever else she need for the house. I spent about $300 just on help out a month and she want me to pay $280 for rent  on top of my loan  I told her no I'm not a paying rent .. Then she told me pay or look for a place to live my father siding with her just a notice we pay $575 on the apartment we r living in as well I have to pay for my phone I want to help my mom out but I only make $340 a week and need to get my ass back in to school but my saving going to my mother and loan and  fasa only give me $636 per semester .: my mother in law told me u have a place to stay but my boyfriend sister hate me  for selfish reasons .. Honestly I don't know what to do