Why do guys stare at me but never actually come up and talk?

I don't really understand why guys won't approach me. When I go out guys tend to look at me but I never get talked to or asked out. They keep playing eye tag but it won't go anywhere. I personally don't belive I'm insanely unattractive, I have good features, with my nose being the worst but everything else I think is good. I'm skinny, I just don't know what else I have to do.

Why do guys stare at me but never actually come up and talk?
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