Abusive mother

I’m 20 years old & for the most part of my life my mother had been verbally & mentally abusive to me & my sister. More so towards me since we’ve gotten older as my sister lives away for university & so my mum only has me to control. She is very manipulative & controlling & she’s constantly trying to guilt me into things. I’ve always just put up with it & said “it’s fine. I’ll deal with it. I’m fine” my ex boyfriend was always trying to get me to see that my mum is abusive and controlling, & again, I brushed it off & said it was fine. Him & I aren’t together but still friends & we were hanging out a couple weeks ago & I some home & she had gone through my room. That was something that really bothered me because I am 20, I am an adult. She shouldn’t be going through my things & she can’t be getting angry about it since, again, I am an adult. I started trying to find ways out. Rn my parents own my car & my mum uses it to control me because if I don’t get home when she wants me to be home, she takes the keys from me so I have no way of getting places. I have since then started looking at buying my own car & I have found one that I am probably going to get. She is so against it & is trying really hard to get me to not buy it. I want to move out but if I buy the car, I can’t move out for another couple months, until I save up a bit more. I have finally started standing up for myself, it’s taken 20 years, but I’m finally doing it. Does anyone have any tips or advice as to how to get out of here sooner or deal with her in the time being?

Thanks.