I think im anorexic or developing it. how do i prevent this?

See a therapist: Start by seeing a psychiatrist or therapist who's experienced in treating people with eating disorders, for an evaluation. Any needed interventions can be started. Also the therapist can work with you on triggers and problematic behavior patterns. You'll also need to see your family physician for a general health evaluation, because anorexia can cause many physical problems. Good luck to you!