Feeling Constantly Judged

I (17F) am somewhat chubby. I would not say I am slim, nor would I say I am fat. In coaching and in school all my female mates are slim and they constantly judge me for my belly and waist fat like " you should not wear noodle strap dresses as it looks good only on slim girls or you should not wear crop top,bodycon dress as your tummy looks weird in these dresses." A few months ago my brother got married so I was discussing about wedding outfit with one of my friends and she started giving me suggestions about outfit. One suggestion she gave me was about peplum lehenga, as soon as she gave the suggestion she quickly dismissed it by saying "but peplum lehenga looks good on girls who don't have a heavy upper body or who are very slim and you are not slim and also you have a heavy upper body so you should not wear it." All these things make me feel sad , I don't have any problem with my body, so why do other people have a problem? Why can't they just be happy for others instead of always bodyshaming them? They should look at themselves first.