I'm not trying to discount that idea in any way, or try to cut you down, but as a virgin who does indeed consider themselves a bit overweight, I have to put in my two cents. I can only speak for myself, but I don't have high self confidence, and a really pretty girl like you are usually doesn't want to have sex with someone like me. I could be entirely wrong, I often am, but that's just my experience. Practically speaking though, it makes some sense.