how do i build muscle but loose fat?

Question

i'm 14, 68" or 5' 8", 111 pounds or 50 kgs.
i want to be fitter and stronger, for that i'll have to loose fat but gain muscle.
now the question is how do i do it. and the problem is that when the i workout my body burns fat if i eat less calories but how can make sure it does not burn off by abs(or the rest of the muscles).

Answer 1

You'll have to take steroids. Muscular Development has good articles on steroids and positive effects.

Answer 2

Do cardio to work off the fat. Do strength training to build your muscles. Make sure you eat enough protein for muscle building.