My girlfriends sexual past is bothering me?

Anonymous
I've been seeing a girl since around July but before this we were literally best friends. We never had real feelings for each other until around May when we got with each other after a night out. Obviously being best friends I have given her a lot of advice in the past, and she has told me things I wish I had never heard. I have only previously been with one girl before her, and I had sex with her twice. She has had 9 sexual partners (3 of which being long term boyfriends, one being a one night stand). I don't feel insecure about this, I just feel a bit mugged off because she's been with a couple of my friends and I just know every time they speak to me they just think "I've done your girl". Am I being immature?

Furthermore, she has literally done everything in bed. Our communication is great so we talk a lot about what we have and haven't done. She's done it all whereas I have done nothing. So when we try stuff for the first time it feels special for me, but deep down I know it isn't special for her, because she's done it before.

It really bothers me. I know she likes me and on multiple occasions she's said "You're the one", but because I haven't had that many sexual partners I just want to live a little before I start to settle down. It's getting to the point now where I don't feel like I can do it anymore and put myself through it every day. I literally think about it all the time when I'm not with her, but when I'm with her I just can't bring myself to talk to her about it. We have spoken about it briefly in the past and she says it's really upset her because she feels like she's letting me down. I know people say the past is in the past but we're just at different life stages (right girl, wrong time). Thoughts?
My girlfriends sexual past is bothering me?
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