I think it’s time to move out

I am 21 years old with a toddler I still live at home and as more time goes by I feel like my mom and her husband get annoyed by my son and I😔 my mom has 2 younger kids almost same age as my son and they’re always getting into trouble or MY SON is ALWAYS harassing her kids. He is only 4 years old. Her husband and I never had a great relationship we don’t speak at all and basically don’t get along but we never argue. We basically act like we’re invisible to each other. He does little stuff that bothers me, for example last week he parked in the middle of our driveway.. 2 cars can fit in there and he purposely parked that way so that I wouldn’t park my car there. Every Saturday I go to Starbucks for coffee and always bring one back for him but he never drinks it.. he’s just an asshole and I’ve already tried but I just can’t anymore I can’t live here knowing that my son and I are a bother. He always yells at my son because my son is the only bad kid in the house. I would move out but I’m honestly so scared😪 I’m still paying off my car and id need 2 jobs to afford an apt for my son and I.

I’ve already spoke to my mom about this but of course her husband comes first. Also on my day off I stay in my room all day with my son because he doesn’t like when I let my son play around the house so we always stay in my room.. Any advice?😪