Why can't I get six pack abs?

You are way too young to worry about that. However you should research it. You have to eat a super lean and healthy diet. Arnold Swartzenegger can't have ice cream or anything bad ever when he was toning up for his role in terminator again. You basically have to cut all soda and anything unhealthy out of your life. And you have to eat less and only eat fish and lean meats. Buy mens health magazine they always talk about getting into shape and getting washboard abs.