You're probably the "good friend" type of girl, that guys like to hang out with but nothing serious.
I have a friend like this. She always plays cool and she's a good friend but she's friendly with all guys and I think nobody can have REAL chances at her.
So, if you want to break the circle, just "choose a guy" and show him that you like him. He'll probably respond and the rest is up to you two. :)