waist (be honest)

Do u think there’s a problem with a size 8 for a girl of average height? I know plenty of girls size 6-8 I wouldn’t have thought there’d be anything wrong with a 8.

I’m 5"6 and about a size 8 and my tummy isn’t even totally flat. I know I’d look better a bit slimmer (I was a six until about 2yrs ago when my metabolism seemed to slow down a bit :()