I am addicted to sugar how do i stop?

I am not a medical or psych professional so this is total speculation, but I wonder if that qualifies as an obsessive-compulsive (OCD) behavior, because it's so specific. If you can see a school counselor or other counselor, they might have some thoughts about that. Your regular general practitioner (doctor) might also. I really suggest asking them. You are very young, and the younger you get a handle on habits that bother you, the better, so this is a great opportunity to deal with this.