The way clubs are presented in most anime series, I get the feeling that students in Japan are highly encouraged to join at least one club while you’re in high school or college. We never see a character say “Eh, I don’t feel like joining a club. I’m just going to go home after school and play video games or something.” Granted, a lot of series have plots that hinge on characters joining clubs, but there always seems to be a major push for characters to hurry up and pick a club. If a character is hesitant and can’t choose a club to join, that character always has a friend that’s encouraging them to join some club or another.
From what I can tell, it’s like there’s a social stigma placed on not joining a club. If you don’t hurry up and join, there’s something wrong with you.