Body weight vs body fat?

I'm 5'7 and I once weighed 160 and had a size 13 pants size then I went to a size 7 at 140 but I've been going to the gym and I weigh 158 but I'm still a size 7.. my friend likes to say that I'm fat because I weigh more than her but I'm a couple inches taller than her and I think I'm not as fat.. not to be mean but I think I have a less amount of body fat.. I've suffered from body issues and I was really proud of my body finally but once she started saying something about how it only matters who weighs less.. I have a very nice body and I carry fat in the places I want so it's not like I'm ripped but it still bothers me.. does it actually matter about weight?
Body weight vs body fat?
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