You're still young though. In a few years your metabolism will slow down and you'll begin to see fat where it didn't exist before. You do bring up a good point though, since most kids have superior metabolism to adults. In other words, is it best to get kids to learn healthy eating habits when they're kids, so they don't have to worry about being fat while they're older or is it better just to let kids eat whatever they want as kids when they can enjoy it without having to worry about packing on the pounds.
Still, though, even though kids have better metabolism than adults, you still hear stories all the time about childhood obesity. They have a show on ABC called Shaq's big challenge where Shaq helps overweight kids lose weight. I have to wonder, how did these kids get so fat. I mean, I used to eat junk food all the time as a kid, and I don't remember being that fat. Maybe it's not the breakfast foods that's making kids fat, but the fast food. I mean, a bowl of cereal only has about 300 calories right? Yeah, it's not good for you, but compare that to a 1000 calorie meal at Mcdonald's. Which one will make you more fat?