Happy birthday.
I remember when I turned 21... My friend dragged me to this club called Bar Sinister down near Hollywood Blvd back home. I'm really not into clubs, drinking, dancing or strippers... but I went, with my girlfriend's consent. Spent the whole time in a corner watching people. I wasn't pleased with the event in general. Either way, girlfriend wasn't happy about it, after I went of course.
Advice to you, speak up and do what you want on your birthday.