Please don't start bulemia. My neice did this for years, to only lose weight for a while, but she has three children now, and started again, and now she has ruptured her esophagus and was hospitalized. The doctors say that if she trys to make herself through up one more time, she may bleed to death. Her esophagus is so badly scarred now, the damage is done...it's a horrible habit to get into since you can't stop doing it..so don't start. If you're worried about gaining weight, just eat healthy foods..fruit, meat, vegies, and you won't gain...stay away from fast food and snacks and sweets. If you eat healthy, you won't gain a pound, and you'll feel great. Please don't obsess about your weight at this age..it's not worth it...get some hobbies and you'll be fine.