Unstable home and emotionally abusive mom

Hi this is my first time on here and I didn’t know where else to turn. I’ve had a bad night and I did self harm which is something I haven’t done in a few years. I just really need someone to talk to/vent to please so here it is My parents have a really toxic relationship and they’re only “together” still because of financial reasons but they fight all the time, all of which are instigated by my mom over small unnecessary things that do not need to be screamed over. She blames my dad, my 22 year old sister and me (19) for everything, but mostly my dad. Usually these fights end with my dad leaving and not coming back until the middle of the night, leaving us to deal with my mom. This is when she’ll call us worthless, pathetic, lazy and tell us we do nothing and deserve nothing even thought we both work 40+ hour weeks, are good kids and stay out of trouble. My mom has undiagnosed mental disorders and refuses to get treated. She has control of our bank accounts so she can take our money at any time and we can’t do anything about it. She treats us like we’re children even though we are adults and doesn’t let us do anything besides go to work and come home. I start working 60 hour weeks next week and I’m so mentally and physically exhausted and burnt out that I can’t do this anymore. I need the money so I can pay for school and try to save up to move out but everything seems to hopeless I don’t know what to do. Every night is the same and nothing seems to get better. All my friends tell me to just get in my car and drive away or stand up to her but they don’t understand that I can’t do that. She has complete control over us and I feel so helpless. Every night I’m miserable and just want a different life