Don't get too hard on yourself! He might have a different view seeing all these girls at the club acting crazy and mistakenly thought that you were one too. If he's been looking for you "through a crowed room" yes, that does mean he is interested but maybe he's not sure how to handle it because he's been burned before. Don't give up on the chase just yet. Let him get to know you better and see if he asks you out. I'm not saying be aggressive just say hi and have short conversations about things like you already have. Just give it time. He'll see you're not a "club girl'. Maybe it would help if your friend tells him that you're really shy. I've asked a guy out before and it does get easier each time but also remember the attraction may be one sided and you might get turned down too. One thing I've noticed about guys is that they LOVE a woman who exudes CONFIDENCE. In her manner, in her walk, in her clothing, everything. I'm not knocking being shy, I am too but when I want to talk to a guy, I think that I'll never know if he was the right one, so I have to step up to the plate and begin with "Hi". If he smiles and continues the conversation, I take that as a good sign. Although it doesn't hurt that I love to flirt too.
You go girl and keep your head up.