I'm not awkward when it comes to flirting; I'm actually pretty smooth.

haha but I've just always been a flirty person. Girls accuse me of flirting with their boyfriends when I haven't been. My body language is just naturally flirty.
That being said, when a man makes a move toward me, or starts trying to flirt with me, I brush it off. I'm not sure if it's a self-confidence thing, or if it's because I've been hurt in the past, but if I don't initiate the flirting, it's a no-go!
My friends, too, always ask me why I didn't flirt back with X or Y, and I just tell them that I wasn't interested, when in reality, I hadn't even given it any thought. I just automatically assume nothing will come of it and move on.
Sigh. I don't know when I started being like this, but I also don't know how to open myself back up. :/