I need to move help ( might be a confusing story)

Me and my boyfriend recently had a baby but the thing is we live in two different houses.... And the only reason for that is my mom wont let me leave.... im 19 he's 21 he has a job rn and going to the military soon but i dont I'm just going to stay home and care for the baby he told me he wants me to do that he said i can get a job later i just need to rest and care for the baby while he worries about everything else. He even told my mom about him going to the military and stuff when the baby gets up in age and he told her he wants to marry me he's a great man everyone loves him but my mom tries to do everything i still share a room with my sister....at 19 with a baby... but she got mad at me one day i tried to apply for an apartment she seen the papers and went off saying when was i gone tell her this and that and im taking the baby away from her and she bought the baby all this and stuff i appreciate she did that,But my boyfriend already bought her the same stuff she tries to out do him then gets mad because i dont involve my older sister in stuff me and him do willl go out or something she'll say you did ask your sister did she wanna go or why didnt yall bring her nothing back or when i had the baby the doctor needed to speak with me and the dad alone my mom went to get food she seen my sister in the hall she came in and said i was treating her wrong and stuff and that started more drama honestly

its getting old im ready to move out im not scared of her or anything i just dont feel like arguing with her advice?