mom doesn't like boyfriend

My mom doesn't like my boyfriend and doesn't think he's good enough for me, of course there are some things he needs to work on. He's 26, I'm 19 and he lives with his mom bc of reasons that are extremely understandable! However, we plan on moving in together sometime this year. My mom and I are extremely close and I don't want this to effect our relationship, but I just don't know. My boyfriend makes me so happy! And he loves me very much so I know I shouldn't leave just because my mom doesn't approve, I'm hoping she comes around eventually but I just don't know and it's stressing me out very much! Any advice or anything would be great please!