I want to be anorexic?

I feel so fat compared to all my frends. I am 13 5 3 and 123 pounds. Since sunday i have bbeen eating less than 1000 calories a day. I really really really need to get down to 105 because i have to wear a "skimpy" (tube bra and skirt) costume for dance this eyar. i dont know what to do this is my last resort. i need to get down to 105 by christmas. if i continute to eat less than 1000 calories a day will i be at risk of anorexia? im confused and i need help to get to my goal.