Boyfriend Goes To Bar Every Weekend

I’m 17 and my bf is 19. For the past few months he’s been going every Friday night to the bar with his friends. He gets drunk and spends the night at his friends house. I told him I didn’t like him going every weekend but he says I’m overreacting and that he’s just having fun, he keeps telling me I’m acting like I’m his mom. I asked him if he could go less but he doesn’t want to. I just feel like a guy with a gf shouldn’t be getting drunk at a bar every Friday. I get he wants to be with his guy friends but I really don’t like it. Also because I’m underage I obviously can’t go with him. Thoughts? Would u be okay with this?