looking for: Social plugin that allow my users to create groups

Title Has it, my project is completely stuck, I can’t do a thing before I have a system for this.

Buddypress doesn’t work cuz it screws up all my themes nomatter who and what designed them. So that’s a no-go

I really need something that will allow a user to create a group then other users to join this group and have the original creater ( or moderator of the group ) having to confirm them or something, or send them password or link.

Really really need something like this asap, I’ve looked like everywhere!