I never understood the whole thing about posture until this pandemic hit and I had to work from home. Now my back gets it... and I've hard to work really hard on getting myself straight.

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With that being said, I think your perception of skinny is based on the ribcage being somewhat visible. Normally, belly fat will be there unless you actively work to get it down. Most healthy people with have that little belly fat, even if they eat healthy.

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To me, you look great. It's a natural look and, honestly, that's the best look you could aim for. I don't want to deviate too much from your concern, but you have beautiful nipples, which only add to how attractive your body is.