I have had this experience as well. I have been with only one other person, and she is my wife. I don't regret not "sowing my wild oats" because with her things are perfect. I was her first, she was mine, it works, and it is great. I know that it was stated that your girlfriend has been with 1 other, so I can see you feeling like you missed out. I go with the theory that things are what they are, and just be happy with it. If you go looking for better on the other side, you can miss what you had in the first place.
I compare it to flipping through the channels looking for something better to watch. Nowadays there are so many channels, that by the time you get through them all, the show you were watching is already over.
