Being called pretty but no one likes me?

I'm quite insecure, I don't think im pretty. But I've had a lot of people call me really pretty (all ages and even a few guys), but no one has done anything. I'm not in a rush to get someone, but if I'm perceived as pretty or somewhat pretty, how come there hasn't been any guys talking to me (again I can't fathom the idea of someone liking me).
Being called pretty but no one likes me?
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