Hi, 24F here. I can relate to how your girlfriend is feeling. I lost my virginity when I was 15 (young, I know) to a 20 year old man. I was so scared it was going to hurt that I only let him put about half of himself inside before I made him stop. I suppose he broke my hymen at the least because there was some soreness and spotting after that. We ended things and not long later, I met someone else who had a much smaller and less intimidating member. I still count the second one as my first despite all technicalities pointing to the 20M as the first.

Nothing is wrong with your girlfriend. It sounds like she loves you and wishes you had been the first. If you bring it up again to try to force her to say it was that other guy, it will probably hurt her feelings and bring up bad memories. She’ll be okay with how things are now.