Is it unhealthy if a 19 year old has never been in a relationship before?

I'm 19, and a boy who liked me kept on asking me why I've never had a bf. I didn't feel comfortable answering bc it's hard to explain. Tbh, I'm just shy, not the most attractive, and always had crushes on people who were taken, so I never had a bf before. Is it really that weird? I know some guys see it as a "red flag"

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