Why does my mother make me feel so low?

My mother was discussing about my elder sister's marriage and said that how beautiful will she look as a bride, and then all of a sudden she said to me that you don't feel bad that I'm not saying the same to you because you're a kid and you'll change in some years (by changing she meant looks).. And also, I am not a kid I'm a 23 year old grown up.. First of all, I feel there was no need to bring me up when the topic was about my sister and if she actually brought me up, she could have given a compliment or two.. I'm just crying since an hour because I feel I am not pretty enough.. Am I overreacting to what she said?

Why does my mother make me feel so low?
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