Well, there's lots of different kinds of disordered eating, so whether or not your experience was anorexia pretty much depends how you define the term (I can't remember how long the DSM figures you need to starve to qualify for the diagnosis, but it certainly doesn't have to be long-term/chronic. Women get enough shitty messages about their bodies that it's not surprising that disordered eating is super-common, but it probably takes several more factors for it to become, as it were, a lifetime project.