I'm near underweight but I'm not slim?

I'm 164 cm tall and my weight is 52 kg ..and bmi calculator shows that I'm close to underweight . Can it be wrong?

Because really I don't think I'm slim , I have fat legs and arms..

I have also friend who is same hight and same weight and I find her really skinny! Why don't I look like her then if we have same bmi?
I'm near underweight but I'm not slim?
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