his family doesn't appreciate me

I am honestly so in love with my bf. I am hard working and very ambitious and have lots of goals for myself. Since dating my bf for the last 3 years he has become much more outgoing and more involved and he has told me that I have helped him be like this. He was never going to go to college, no plans and now he does. For some reason his parents have never liked me or appreciated me dating him. Ik my bf has made me a better person and my parents can see that I just don't get why his feel like I'm a burden to him. Anyone else feel the same?