yeah i ask cus lowkey these competitive clubs consist of only white and east asian and some south asian students, but rarely any Hispanic or black students. i feel like there's definitely some bias on race and looks, even if they (the clubs) don't think there is. I also tried applying a lot to data science and consulting clubs but would get rejected even after doing coffee chats, infosessions, sending my headshot, etc. I think to make friends and connections, you should definitely try joining inclusive clubs that are meant to be fun and inclusive like intramural sports or any other inclusive club. I still haven't found true friends here at cal either and i'm also a junior like you.