The vast majority of men my age have had at least 1 girlfriend. How come I have had none?

I am 27, turning 28, and never had a real girlfriend. Meanwhile, most all of my former friends are married and have kids

I don't have a very big social network. And yes, although I do seek a woman without a romantic past, most women do not show interest in me anyways.

Does this mean I am defective as a human male?
The vast majority of men my age have had at least 1 girlfriend. How come I have had none?
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