Am I selfish?

Hey everyone, I'm in a really tough situation. My family is toxic and they stress me out so much with my "future" that they do not care about my mental health. I had problems in the past because my father was abusive and I didn't eat *couldn't* lost weight to the point I was a stick, and the sad part is, my family still keeps him because of his retirement money. I moved out and lived with my sis & her husband in a 2 bed apartment. The problem is I want to move in with my bestfriend of 7 years/boyfriend of 2 years... but they "guilt trip" me and threaten me with their health if I ever leave the family. I work full time and go to college full time. My other half works full time in a great federal position but he isn't a "doctor" or has his "bachlors" so they LITERALLY say," I date a failure." He even went back to school for his bachlors in business just to prove toy family he is serious with me, but they still shame us. I don't party, don't do drugs, just wanna live a happy simple stress free life. So now they threaten me and say I have to move back in with them, while my abusive father still lives in the same house. So, big question --> is it selfish for me to want to move in with my boyfriend and request some "space" from them? Or is that selfish of me?" Thank you for reading this❤