What makes a pretty girl "unapproachable"?

Baranishere
The question is pretty self-explanatory. One which I have struggled with. I know girls who, according to beauty standards, are pretty but some of them often complain about "having no chance with guys". Since I'm not at all experienced in the dating realm, please explain this to me: What makes you not want to talk to you a pretty girl? Is it you not feeling confident? is it the girl not sharing similar interests with you? is it her mannerism? is it her shyness? is it her unfriendliness? I am honestly baffled by this!
What makes a pretty girl "unapproachable"?
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