Most Helpful Guy
Hmmm. You need to be more forthcoming with your flirting. If you like the look of a guy and you see them staring or overhear them talking about you you neeed to be outwardly flirtatious by smiling at them or winking. Maybe nod at them.
The problem us guys have is that we do not know if you Girls are one of the Following:
1) a Lesbian
2) Got a Boyfriend/Girlfriend
3) A complete bitch who attacks a guy for trying to spark up conversation
Once you have given the signals it should then be up for him to go over and start conversation if not either he is really shy or he's just not interested.