How old are you? It seems to me that you have an eating disorder
. Eating disorders are generally associated with self esteem issues and/or depression
. I would suggest that you meet a clinical psychologist
or even a psychiatrist
as soon as possible as early intervention helps in most cases. Do not label yourself as lazy, these negative stereotypes will not help you, you are just like anyone who needs help. What will help is to consult your school counsellor who may refer you to the appropriate professional. Or alternately you can consult a clinical psychologist or psychiatrist directly. REMEMBER there is no shame in this! Courageous people are those who admit they need help, and then seek it. You have already taken that first step by posting this query on line.
Take care. Things will improve.