Why has no girl ever shown interest in me?

I'm almost 20 now and I've never had a woman attracted to me. It seems that no matter what I do to improve myself I'm always overlooked. Even in college surronded by women everyday I STILL haven't been able to attract one. I can talk to them fine, but they don't view me in a sexual way. How can I accept this? Has this happened to anyone else? I'm reaching my breaking point.
Why has no girl ever shown interest in me?
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