You don't need to fake liking pop-culture if you don't. Maybe try looking into some clubs or groups that have interests you share? Do you like games, or history, or cooking? Maybe a sport? It might help to look for people who also enjoy the things you like rather than trying to pretend you like what 'most' people do.
Superficial 'normal' teenager behavior was never my thing either. Pretending it is won't make you any happier, trust me.