Why do guys never approach me?

Before people say something like "you're under 18, chill", I'm actually not. I'm 18, almost 19 I don't know why my profile says under 18. Anyways my issue is that guys never approach me. I've gotten from a lot of people that I'm "intimidating", which I don't think I am. I don't smile 24/7, but let's be honest, who does? Legit every time that I signal a guy that I'm interested they either just stare at me or come over and talk to me and are really shy. Am I doing something wrong?
Why do guys never approach me?
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