How do I get thin in a month?

Alright. I'm 5 foot tall and 12 and I weigh 100 pounds!!!!!!!! OH MY FUDGING GOD!~@@@ Ok so now that my little spazz moment is over, I need to get thin thighs and face in one month because I'm going to Germany to visit my Grandmother and my uncle (who is FUDGING 13!!!!!) is going to be there and he is thinner then me and it really does bother me and I want to be thin. Please do no say that I'm fine or that my weight is alright because I'm fat ok? How d I lose weight!