Why no guy approaches/talks to me?

I'm 22 & since I entered university no guy talks to me or approaches me. People tell me that I have a resting bitch face but when I used to be 18,19 I got approached by a lot of men so if resting bitch face was a problem then why I got approached back then and not now? Even my friends get a lot of attention from guys but I only get stares and no one talks to me. Why is that?

Why no guy approaches/talks to me?
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