If you haven't seen your doctor already, you may wish to do so now. Sometimes having a high weight such as this could indicate an underlying disease, such as...once I heard of something...maybe it was called cuffer's syndrome...but it made you gain weight alot. Until you can see your doc about this try to lose weight by excersising and eating healthy. This site has some really good tips if you look around (and I'm sure some kids have good tips too!)