I hate not approaching girls when I get the chance. Help! this is frustrating...

I saw a girl yesterday, she walked past me and looked super cute. She smiled at me and I Reciprocated, but I didn't follow up and it eats at me every time a girl shows interest, I fail to approach, even though it's easy enough to do. I don't know why I'm asking for advice, as I know what I need to do, I just fail to do it. Do you know how frustrating this is when you're 24 years old. The only time I meet girls is when I've been on vacation or trips to other parts of the country.

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