I've never been liked in my life, what makes me so undesirable?

No man has ever liked me in my entire life, all my friends have had bfs or guys have liked them in the past since like primary but no guy has attempted to talk to me or go off with me or even ask me out so I wanna know what makes me so undesirable and is there a way to make myself desirable?
I've never been liked in my life, what makes me so undesirable?
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