Baal,
You seem like Genius

Seem is the operative word kid. Like the man said, just be yourself. It's all in the body language. Let your instincts do the talking.
Years and years and, ohh, years ago, some one, I forget who, discovered that when man fancies woman his eyes flash very quickly in this order - 'eyes, tits, bottom, eyes' and if the woman is responsive it's 'eyes, bottom, eyes'. This all takes place in about 3/8 of a second.
But , in case you feel constrained to force the issue with the girlie of your choice, you must remember that it's also been demonstrated that people are very good at sussing out fake body-language.
So, take note of who, if anybody, is exciting your interest. It could be that one of them is giving you come-on signals that you, thro' lack of practice or social acumen, are missing.