Whats The Best Way To Lose Weight? (FAST)?

Hey i Wanna Know The Best Way To Lose Weigh? I'm Thinking Bout Taking Diet Pills But i Don't Know Which Ones Work Best I'm 15 And In High School For Most Of You Know High School Kids Can Be Really Awful i Been Over Weight Since i Was 8 But The Kids At My School Don't Know The Story On Why Im So Over Weight When i Was 7 i Had A Very Bad Asthma Attack And Was Rushed To The Hospital And They Put Me On The Breather But My Lungs Were Too Weak So They Told My Mother And Grandma That If i Don't Get These Shots Called Steroid's Shots i Would Die Cause My Lungs Where So Small And Weren't Getting Enough Oxygen So The Shots Would Open Them So They Gave Me At Least Five In My Chest And i Had To Go Every Month For Five More And i Was A Size 5 In Kids i Was Really Tiny And Before i Knew It i Was A Size 10 So They Stopped The Shots But Because Of The Shots i Grew Big Now Im A Size 16 i Think Or Maybe More Im Ashamed Of Who i Am And What i Look Like my Mother Says Im Beautiful But i Know She Lying And The Kids At My School Make Fun Of Me So Help Me i Wanna Lose At Least 30 Pounds Or More In 3 Weeks Cause That's When i Start School i Wanna Go Back And Let Everyone See i Am Pretty Help Me Out Please Thanks For You're Time And Attend-ion (: