Eating Disorder..Help!!?

That sounds fairly normal to me-- it doesn't sound like you have an eating disorder. Eating breakfast is healthy, keep doing that. Eat something for lunch... other than that you sound pretty normal. Everyone metabolizes food differently, and you may just have a fast metabolism and a thinner body type. I inherited one from my dad, I'm 5'5" 106 lbs. Just eat three meals a day, if you aren't hungry/starving yourself then it simply sounds like you don't have an eating disorder.