Why do most women envy women with a small waste?

Im one of those women that have them. I have a fat ass body and I'm trying to lose weight. I have an hourglass figure. I get nasty looms from over ladies. Some of the women in my family envies my body and wish they had a waste like mine. My late mothee would tell me, "Honey you're not fat. You're just curvy. A lot of girls KILL for curves and you're very lucky. Women wanna loom like women and thin isn't always good."