Why do guys like me all of a sudden?

All throughout high school and my first year of college I was ignored by guys. Over the summer, guys all of a sudden starting paying attention to me and liking me. Now it seems like a lot of the times that I go out, I get hit on or asked out. It's a very strange thing for me and although the attention is nice most of the time, its confusing to me why it happened so randomly. I'm 19 by the way and have never had a boyfriend (sad, I know).
Why do guys like me all of a sudden?
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