If you're worried about being "fat" or thinking you are, just have sex . It burns like a shit ton of calories, and then you will loss so much weight and feel more in shape.
- something I randomly thought of today..
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.
Hurhur you are cool and rebellious.
It's only good exercise if the sex is good, because sometimes you just sit there like. DURR, and wish ya just had a vibrator instead.