I wanna be super skinny?

hey. I really want to be super skinny for christmas time. I tried anorexic but i get thiss major headche. I dont want anyone telling me that i shouldnt do it though. I want to and i wont change my mind. I want to lose 40 lbs. Also, i want to lose inches on my stomach,thighs,and arms. I dont want to buy anything. No lipo either. Im in the 8 grade so. please im desperate.