How do I stop thinking about this girl?

So there's this girl that comes into my work every now and then. She would always smile at me and act bashful. About 2 weeks ago, I mustered up a little courage and talked to her. She seemed glad that I did and said she would like to talk sometime when I asked her. I gave her my number figuring she was going to give me hers. She acted confused and said, "Oh, cool thanks." I should of just asked for her number. Anyways, she never called me and I feel really pathetic because I can't stop thinking about how I screwed up. Should I try and talk to her again the next time she comes in or do you have any tips for forgetting about it? Thanks.