I'm in a club but I didn't enter it

why not just leave the club

[zombie-brand-facepalm]

It happened to me too. There might be a way(if you're not the leader) like asking the leader or someone with higher ranking in the club to kick you and invite you again, if that doesn't work try I don't know then. I can't used what I wrote here because I'm the leader of my club and no one can kick me out.