I can tell you, Im 5ft 2, wear size 8 jeans, skirts and trousers, a 12 top ( XS in some places) yet Im over 9.stone and just touching the healthy BMI , and sat here, I look like a Buddha - fat fat belly
We all come in different shapes and sizes. My friend is nearly a foot taller, 2 stone heavier , we we wear the same size in dresses
You need to find a bit of confidence in yourself. Easier said then done, mines only here sometimes cos post menopause I dont give a f much now
But that's taken a lot of learning.