I was also 23 - and that's not as unusual as you might think. (But it was about 10 years later when I learned that.)I was a late bloomer. Like 23 years old late.
You should be looking for a different group of friends. Seriously.And I paid the price with the teasing I got.
For both physiological and emotional reasons, you should have let her know beforehand.No, she didn't know for a couple months.
If she had even a hint of this, then her behavior was inconsiderate to the point of being uncaring and abusive. In retrospect she was a poor choice for a first partner. I hope you found a girl who respects you.With social anxiety disorder, self-confidence issues, etc.
My first (also a virgin) knew we were each others' first. Despite the significant pain of rupturing her hymen and stretching her vagina open, we did it 5 times in the first 24 hours, too.She did not believe me, lol and we had sex like 5 times that night.