Everything I try on in shops now doesn't fit.

I've tried to go for the whole "everyone is shallow, I don't care, I'll wear stuff that DOES fit even if it looks terrible" approach but even that one is wearing off. I've started exercising more in the hope of toning everything down a bit but still nothing fits.

I have a friend who is a size 6, smaller than that, and everything she tries on fits perfectly. And then there's the friend who is a size 16, yet she still manages to find loads of very nice clothes in our town. Maybe I'm too picky and don't give anything a chance or just maybe nothing fits.

I am a non-existent size.