How can I (20M) deal with gf (20F) past relationships?

I just gotten into a relationship with a girl and everything about it is perfect and we’re really happy together but I’ve never really gotten far in them before so I had given her my first time. A lot of the time I kinda struggle with the fact that I’m not her first and that she’s had multiple before me and I really just wanna know if it’s normal for me to worry about the past or if I should remind myself that now is all that matters. I’m really just looking for some outside perspective on how I should view something like that which bothers me here and there or what to do when I’m feeling insecure because I’m not the first.