Girl's Behavior

I missed a chance to ask her out and now I'm kicking myself

There's a girl I like and I had a prime opportunity to ask her out..she was alone, walking, and I drove right by her and did nothing. The thing is, it didn't occur to me to ask her out then until about an hour or two after the fact. Still, I keep kicking myself. I waited for an opportunity throughout the day and there was none, and I know this won't present itself like this again tomorrow and for a long while.

I mean, a couple of friends and I were going to see a movie tomorrow and I should have asked her to come, but I blew my opportunity. So basically these events for repeat themselves again.

The problem is that I'm feeling really, really bad about this. My mood shouldn't be affected like this and I invested too much in that situation.

What can I do?

I don't have her number or anything and talking to her during class is impossible since when she's surrounded by friends, I can never get eye contact with her.
I missed a chance to ask her out and now I'm kicking myself
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