Why does my mum always point out my worst features?

My mum seems to like to criticise me, she said my forehead is ugly and I was trying on a dress and she said "I can see you tummy poking through" while smiling. But other times she tells me I'm too thin and look anorexic. A person told me I look like this celebrity the other day and my mum goes "no, my daughter has a much rounder face than her." She said I've got such a round face and "didn't inherit her high cheekbones" and that I've got no cheekbones. This stranger said I should be a model and my mum goes "really? I don't think so." Why is she so critical?
Why does my mum always point out my worst features?
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