I don't really understand the question, but I am going to try to answer it anyway. I can only answer it really with regard to myself as a female. As a female I have (am frequently presented with and understand that men are generally attracted to) a particular image of femininity. As a tall, facially unattractive and obese woman, I in no way embody that image. I never have, even when slender (though it was closer) and my body image has always been incredibly poor. I believe that 'society' ties the female gender's worth to a particular body image - knowing that intellectually does not enable me to separate from it and I believe that stereotypes are true because they are so frequently true. The "perfect" body or appearance is a stereotype, of course, but only because it is very much the majority preference.
My mental health suffers because I feel unworthy as a woman and thus as a human because I cannot 'attract a mate'. That is what it boils down to, for me.