Advice!!

I’m 21 years old. My boyfriend is in the military. We’ve been in a long distance relationship for about a year and a half, and we’ve been close friends for over 4 years. I work full time and I’m a full time student. I decided after this semester, I want to just study online and get a certificate because I’ve changed my major 3 times and college isn’t for me. My mom was not happy when I told her and she doesn’t support the idea. My boyfriend and I have been talking about moving me out to him so we can live together (finally). I’ve been living back with my parents for about a year and I don’t know how to talk to my mom about it without her being unsupportive or not have a good reaction, even though she adores my boyfriend. Please help