<human>: Can you condense the text into three sentences or less?

I have been dating this girl for a little over nine months, and for the majority of the last five months, I have been stuck thinking about her past. She told me about how she lost her virginity, and how her cousin made a bunch of advances at her, and how she got cornered by some large guy at a theatre. I mean, I feel like I shouldn't be having that big of a problem with it, as there are people out there with far worse romantic pasts to deal with, but it still bugs me all the time. She lost her virginity two years ago to this guy named Tyler (who is a total piece of white trash) and she was actually my first kiss(I'm twenty, she's twenty-two.) I guess I'm just really naive and assumed that she hadn't done anything like that. I just get stuck in thought about it VERY OFTEN. When we're kissing, I can't really help but imagine who else's dick has been in there. She's a really sweet girl, and the sex is great, but I'm just troubled. Am I just being a bitch? I kind of feel like a bitch. Are these feelings normal?
<bot>: My girlfriend has a colourful sexual past and it's giving me emotional problems. I'm probably overreacting horrendously.