Why is everyone so ashamed of their bodies?

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It seems that every where you go you hear someone complaining about the way they look. I am 5 foot four and hundred and sixty pounds and feel that I am over weight but have never once not excepted the way I look. I have always been a big person and so I guess that it has never bothered me because I have never had anything to compare my shape to. But my sister has been plump - skinny and now she is going to have a reduction because when she was pregnant her got bigger and it makes her back hurt. She has had plastic surgery - tummy tucks - face lifts - lyposuction - hear peices - and wears makeup way too thick. Why cant she just let herself be. I was just wondering if there is one thing that you could change on yourself what would it be? For me I guess it would be my belly balge. hugs