The fact remains that most people on this forum are either whiny pre pubescent outcasts, or middle aged men who've given up on their social lives. Except that's not true, there are a wierd amount of normal people here (for a Nintendo forum especially), I think there's always been some good advice.
Here's some from a particularly jaded, sociopathic direction: Fuck it, girls/ people in general tend to be particularly inconsiderate about others' feelings, you don't seem to know her that well, and she could very well turn out to be a total douche. Hunt around a bit more, you seem like a reasonably social person, go out with girls as friends more, enjoy their company, and then think about making a move.
And most importantly; Drink up!