Do I have a problem, I think no one fancies me?

I have a problem thinking that no one fancies me. I am quite pretty I think, but I just can't tell if guys like me. I mean sometimes guys stare at me but that could be for any reason couldn't it. It's worse when I like a guy, I start to think I have no chance in hell with him and start to look for signs they fancy my friends. Why do you think I think like that? It makes me feel awful. Once even everyone said this boy liked me, but I honestly couldn't see it, I thought personally he liked my friend or anyone but me. Do you think I need to go therapy or something?
Do I have a problem, I think no one fancies me?
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