Perhaps your parents don’t know what to do or say? I would suggest that you ask your doctor for a referral to a psychologist who treats people with eating disorders. You could also ask your school counselor or school health service to refer you to someone. Then ask one or both of your parents to go with you to the appointment. If they don’t go with you, ask a friend who knows your situation. It would be good if you had your parent’s support, but if they are unable to help, ask a friend for support. You can do this.
You could also ask your parents to read my bulimia topic to give them some background information.