How to stop getting tired when drunk

Hello. 20 year old college student here. For the most part, I get really tired when I drink, to the point I’ve stopped going out because I know I won’t enjoy/will just want to go home. I know this may sound silly, but I’m so young and still in school and I want to be able to enjoy going out/drinking with friends/peers, but it’s just become so difficult. Just last year, and back in September of this year I used to be able to drink very heavily and last all night long (many nights starting to drink around 6/7 and lasting until 3am etc), additionally I would never get hungover, if anything I’d be more productive then usual the day after drinking. Now I drink just a little bit, and get so tired. I also sometimes struggle heavily with getting drunk (drinking my usual amount but don’t feel anything at all). Any tips would be appreciated