How many good looking females ACTUALLY are insecure in a bar setting?

I am a 25/m. Not trying to be cocky, but I know that I'm not ugly (though admittedly I'm no Taylor Lautner either). I just want to know how many attractive girls are ACTUALLY unsure of themselves in a club or bar setting. I hear it all the time: They're just as self conscious as everyone else. You're the reason why we go to bars and clubs (let's be real here)? I just feel like they know that they pretty much have the upper hand in that situation.