I need helllllllllppppppppp (weight loss)?

Ok. I am 13 and I weigh about 155-160.I mean I don't look obese or that fat really (i mean in a way ya)...just not the skinniest person ever.Im in the 8th grade and next august I will be starting high school.Now im not telling my parents that I need to lose weight or asking them to buy me a program or whatev. Me n my family dont talk about stuff like that. I need a website online that is free you dont have to download and you can lose like 50 pounds in about 9 months that should be MORE than enough time. The thing is I seriously need a program that will really work. By the time I get to high school i want to be skinny and I just want to change my look. I want to be skinny but not frickin toothpick thin.And its not like i can throw out all the bad food in my house or whatev im just gunna have to like ignore the stuff. So plz help???Oh and another question. When or if i lose the weight will i have like a bunch of extra skin that i will like surgically have to get removed like the shows on TLC?