I am I too young to go on a diet ?

I am 16 years old and I have been doing martial arts for years and I have always been skinny (not stick skinny!) and I am trying to build good abdominal muscles for this is very important for balance and generating power in kicking. In order to make them visible is to have low body fat. I do the usual aerobics exercises and have a strict ab workout routine. I’ve lately found myself trying to purposely starve myself to reduce body fat despite my strict workouts. I guess I’m partially impatient. I’m not overweight at all! What should I do ?