Moving in

my boyfriend and i want to move in together, we have been dating for almost 3 years and we feel like we are ready because honestly we have been through a lot and have grown up together. we would move in into the back of his moms house, she is great btw she loves me. while we both continue to go to school. BUT my family are REALLY not going to like it, and all they do is talk shit either way but the spoil me once i do this i know it’s over. I don’t know what to do.😭😭 can you guys help