How do I tell my girlfriend that I'm disgusted by her past?

Anonymous
So I'm finally dating the girl of my dreams and up until yesterday I was really happy with my life. But that was until my cousin told me about how easy she was and told me about the guys she would date. All douchey a**holes. I'm basically the only guy she's dated who isn't into drugs and a party hound. I'm the only dude who doesn't use her for sex and treat her like sh*t. And I realized that she's incredibly stupid and really easy. Now I feel like I'm being ripped off because I worked really hard to get her to like me when she would've put out for other guys without any trouble. And now she's noticed that I'm acting differently towards her and I don't know how to tell her that her past makes me kind of sick. How do I explain to her that I'm a bit ashamed of her without hurting her?
How do I tell my girlfriend that I'm disgusted by her past?
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