I [21F] have never been hit on. What can I do about this?

A lot of the women I interact with have been flirted with, asked out or have had a partner at some point in their lives. There are tons of articles on the internet about how women are catcalled and chased every waking moment. This has never been my experience and I have never had a guy show interest in me. It makes me feel sad and less like a woman even though I (now) know that there is nothing physically wrong with me and I am a good, friendly person. I don't quite know what to do and I would really like some advice. The older I get, the more this depresses me and now that I'm nearly done with college, I feel like a failure in this part of my life.

Edit: I'm not overweight. Many of the comments mention that this could be the issue but I'm really not.