I've been with my girlfriend for 2 years now. She's my only relationship

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I've been with my girlfriend for 2 years now. She's my only relationship I've ever been with and also my only sexual partner I've ever had.

We love each other a lot and I can see us being together for a very long time, but it's always at the back of my mind that I'm missing out on my young years where I should have more sexual partners. She's had several previous relationships and casual sex before me so obviously she's happy with "settling" now, and so would I be if I could get these thoughts out of my head.

I know it sounds really ridiculous, but it's eating me up inside because I would gladly spend the rest of my life with my curent gf, but I just can't get these thoughts out of my head. I've even considered cheating on her just to make up for it, but I know that would just make me feel like shit afterwards.

Help me please. No matter how I look at this I just can't seem to have a single day where I don't think about it.