Matt, It's really hard to achieve the healthy lifestyle that you want, if everyone around you is choosing to live another way. I have suggestions that you can try. Ask your parents to shop for healthier food, for you. Bring your own lunch to school and don't obsess about what you can't have. Take walks and be more active everyday. Don't eat and watch TV, you'll most likely end up eating way too much. Don't give into the pressure or teasing that may occur when you start eating healthier. Try talking to your parents about how you feel. If they won't change themselves, maybe they can support your decision for you.