Save my from disappearing!?

Ok, I want to go for a diet, I need to loose around 10 kgs (22 pounds) and the only part of my body I am satisfied with is my chest. I know its natural to lose a little from my s if I am going to lose weight, but I just dont want it! Help me, what should I do? Does it help if I excercise a lot? Or what? I want my like they are now :(((