Is it anorexia or something else?

Patient: At what point would I technically be considered anorexic and should seek assistance?

Symptoms: I am a 24 year old male, 6’1″ and currently weigh 168 lbs. I weighed 189 lbs when I was at the doctors office on November 8th. I do not avoid eating on purpose. I may not believe that my body is perfect, but I do not believe that I am fat. I am just never hungry and sometimes just forget to eat. I have not had regular eating habits since around the time I was 12 years old, but over time they have just gotten worse. At this point, sometimes I will go 2 or 3 days without anything but water because I’m just not hungry.