Guys

I'll be spending the next few weeks studying and i figured I could go around to various coffee shops and try stuff. I normally go out to bars and stuff but want to try cafes out.

For example, yesterday, a cute girl looked at me straight on and gave me the nicest smile while i was in line for coffee and she was seated a few feet away, but she had headphones on so i didn't even bother. Today a HB was sitting a few tables across behind a laptop but seemed to glance over a few times. She sorta looked like someone i knew so i was thinking of going over and asking her if "we've ever met before?" but i figured that would come off as creepy so i didn't bother. In a separate instance, a HB came and sat on a table next to mine but didnt look around/smile and sorta had a grumpy "i have to work" look on her.

so guys Any advise on how to approach? should i even bother if they seem busy behind their laptops/books? or if they have headphones on etc?

Edit: I guess I just needed some motivation. As David Wygant puts it, i just have to get rid of that 'Drunken Monkey' inside my head. Thanks guys!