No. If you're not purging or taking laxadives, then you're not bulimic.
If you're not at all concerned about your weight, and you're not attempting to loose weight, then you're not suffering from an eating disorder.
Actually, your story makes a lot of sense. You are not eating from 1pm-10pm. It stands to reason that'd you be hungry after bmx(ing) for such a long time.
Don't worry, you don't have bulimia.