I know what you mean. If you read my past post, it was still a concern after so many years. It's all because I never matured in the dating sense.
I found the woman of my dreams, and we both had long bad marriages, so in the end, I got over her past and just enjoy her for her.
I think deep down inside you are uncomfortable with the idea of another man having had full access to your prospective mate.
To get over this, I think you need to experience sex yourself. I married a virgin, and things did not work out....after 12 years and 2 kids.
So having a virgin girlfriend isn't necessarily a positive thing. My current love assures me, with concrete proof, that I am the best she has ever had...
which makes me feel lucky and happy. Think about it.... if you end up with a virgin, you will always wonder if she's thinking "hmmm i wonder what it's
like to try other men?"... yuck.