How do you lose enough weight to the point of being able to see your bones?

I really want to...I get made fun of a lot because I'm five seven but I weigh 150 lbs. im 13 and I'm like the fatest girl in my cl...I just wanna be skinny and pretty like everyone else...I think I have thick bones so would it be possible for me to ever be a size two...Can anyone give me any approximation of what the lightest I could possibly be is?? I really don't want to be the fat kid anymore!!!