Moving out anxiety

My bf and I have dating for almost four years. im 27, he’s 28. we are thinking about moving out within the next couple months. i’ve never lived away from my childhood home, didn’t go away for college, and ik when I tell my parents they’re gonna blow up on me. I don’t even know what i’m gonna say. they’re gonna tell me I should save at least 50K or get a new car before or anything to push it off. i have a stable career and job rn, but im very dependent on them and im scared this is impacting my growth as an adult. I already know when I tell them we’re gonna have major fights. im so anxious about this. what should I do?