Totally agree with Svejk, but if you find yourself eating when you're bored, have a large glass of water instead. It will fill you up and you'll eat less.
As to being bored, can I suggest that you investigate doing some work for your neighbours- cut the grass, run errands, etc. with any luck they'll pay you for this. Tell them what you are saving up for - a new bicycle, college whatever, and it will give you an incentive and beat the boredom. Good luck. You sound like a pretty grounded person and I think you will do well.