My girlfriend has been with more people than I have

This shouldn’t bother me as much as it does. We’re both 19, I have a body count of two(including her) and hers is 9(including me). We’ve been dating since March and knowing the amount of people she’s hooked up with still bothers me. Every time i mention it she tries to comfort me by saying “but i’m with you now so they shouldn’t matter” but every time im alone with my thoughts it’s the only thing i can think about. I feel like i care way too much. And Im reminded by almost everything. For instance, one of her hookups was on a school trip to Italy and Greece where she got very drunk. Every time i hear something either about the trip or just even about the country in a news article, i think about it and it’s killing me. She just has so much more experience than i do and im reminded about it constantly. Being long distance doesn’t help. I trust her, but the time away from her just makes me think about it more and more. I love her a lot, and I really see myself having a future with her, but i can’t get over this, even though i really really want to