Worried about moving out

So the first time I moved out last year, my parents made it a big deal and held it over my head. They drink every other day. One night they were both drunk, and my dad wouldn’t stop bothering me. I normally keep in my room because I hate it. I asked him politely to leave me alone, and he kept pestering me; Kept opening my door and standing there laughing and mocking me. This turned into me raising my voice and he started going off about how everyone hated that I was still living at home, and that I should just pack up my shit now and move out with my little boyfriend and his family since they do a better job at taking care of me. Well, that boyfriend ended up cheating on me and I moved back home (lol). I’m planning on moving out again this year in late august early September, but I’m terrified they’re going to have the same reaction, except worse because my boyfriend and I have only been dating for 4 months (that military life man), and the fact I’ll be moving 2-3 hours away.

I mean I am almost 21, and I need to move away in order to attend college and have better job opportunities. My job now is barley getting me by for my car payments. I’m just worried we’re going to get into this huge scream fight where Im eventually going to be forced to leave while they’re still angry, and they’re going to be beyond pissed off with me. I want things to be different this time. I want them to be involved and help me, support me. I want them to trust my judgment.