i don't know how to get through this

I honestly just need to unload this: I live with my twin brother, my father, my step-mother and her 4-year-old son. I have been planning and saving up to move out for some time now, there is still a long time to go. The reason being... my family is unbearable. My brother is a prick who cannot control his temper, my father is grouchy and constantly nagging. My brother and I don't have a good relationship with my terrible step-mother, and her son is constantly screaming, actually, everyone is constantly screaming at each other; being stuck in a house together have not helped. Because of covid-19 my school is closed and I was fired from my job, so it's going to be real hard getting out of here. Not to mention I am getting back surgery in a couple of weeks and i can't get to the preparation appointments, so that is probably going to get postponed.
I don't know how to get through this.