You really cannot lose that much in a month, even if you starve yourself, but if you begin to change your lifestyle now you begin to feel the results almost immeidietley. Eat right and well and excercize as much as you can. You have more energy and once you are on the right path you will feel good about yourself before you even lose the weight! see how much you lose in a month by doing this. I know it feels hard when other girls judge you, but know this: confidence is your weapon against them. YOU know what's important. Most of those girls are floundering right now, all they seek out of life is shallow popularity that will leave them empty in the end. Know your worth, and feel lucky, Madonna!