Q: mike when i stand up i have a good upper body with little fat which i can see my not solid packs but when i sit seems that there is more fat so i feel weird

A: That's normal. When you sit down you typically relax, hunch over and/or lean forward a bit so what you suck up naturally when standing up bulges out and whatever little skin and fat you have on your stomach gets squeezed and folds over a bit. All that gives a different appearence from when you're standing up. There's no way of avoiding it aside from sitting perfectly straight up all the time.