How often do girls get denied when approaching a man first?

I never get approached by guys because I’m fairly attractive and have a naturally intimidating look (not bragging that’s just what it is) but my anxiety about being denied or that he has a girlfriend keeps me from doing so. I don’t know how common it is for guys to deny a girl? How do I know to not approach a guy because he’s not interested?

How often do girls get denied when approaching a man first?
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