How do I stop feeling so turned off from girls when we discuss

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How do I stop feeling so turned off from girls when we discuss previous history? I know I have previous sexual and romantic encounters, but when any of my gfs tell me about hers, I feel incredibly uncomfortable and want nothing to do with her.

My current gf tells me how much she regrets everything before me(only 4 other dudes, and I've been with 2 other girls, and we're both 19). She also reassures me how special I am, and how she has more feeling for me than she has had for anyone else, which I don't think is bullshit. She just sometimes tends to go into a little more detail than I want, whenever the subject comes up about our history. I often skimp on details about my history, and she tends to go on into details about anything she talks about, including previous sexual encounters.

I know part of this is rooted in my personal insecurities, but is there anything I can think to myself or discuss between us that could make me possibly be less unnattracted to her?

[fakeSpoiler]I partially think she's somewhat autistic or at least socially retarded and can't take a hint when to stop talking about something, but I don't want to ask.