How do I get over it?

I thought this girl was interested. She wasn't. It's no big deal, didn't know her that well anyways. I just can't get over it though. In general I'm very social and outgoing, but when it comes to approaching girls I'm not the best and kind of shy, etc. I guess I just got my hopes up and all. How do I get over it though? I want to forget about it and all.

How do I get over it?
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