how can you lose a lot of weight like 100lbs in a yr? im 15 yrs. old and have always been overweight (i might be classified as obese??) i weigh like 268 or around 270...i have tried to exercise at the YMCA but lately i have stopped because i have so much homework and that is the top priority for me i need good grades. i try to cut back on foods but when i see something i NEED! to have it. im addicted to food.i want to lose weight but it doesnt work for me. i cant join another club because my mom is struggling with money already. and i need to lose at least 135lbs in like 2 1/2 yrs because i wnat to look pretty and buy them little skirts and things and i dont want to develop  diabetes or heart disease. 
i also have stretch marks what would be the best product to use...i have mederma or the cocoa one i think its palmers???please help me....

Summarized question: What is the best way to lose 100 lbs?