I need advice ladies!

I'm 20 and have been living at my parents. The situation @ home isn't great because they're basically living in the same house but separated and do things on their own so you can see how it can get hectic at times that's why I spend nights at my SO's house like 3 days out the week. My mom told me if I keep doing it I have to leave the house and I tried to explain it to her but she didn't want to see it my way. Now I don't have a car but my SO says he wants me to come live with him and won't mind being my ride until I get one. I wanted to save money and get a car first but now since my mom isn't tolerating it anymore I feel like I have to move way ahead of the plans I had. Should I force myself to be home until I can get a car or move out?