I'm 189.2 centimeters, am 90 kilograms and am 15 years old.

You're 6'2" (approximately) and weigh 198 pounds - no, you're not too heavy.

There's nothing you can do about your height.

I think there are no problem with your height but your heavy. So you have to reduce your wait.

Your body is able to completely absorb and digest the caloric energy in starches, and therefore the calorie density in this type of carbohydrate is higher than in the fibrous carbs like tomatoes, broccoli, lettuce and cauliflower.thus you can lose stomach fat (http://how-to-lose-stomach-fat-fast.yourhealthorbit.com/).