Do i have an eating disorder or is this like mental or something?

Okay so i had read that by starving and then eating a lot you will gain weight... And i really want to gain weight, i weight 90 pounds and im 15... Anyways so i skip breakfast and lunch and just have dinner... So far no results so i wanna stop eating for a couple days then eat a lot and see what happens... But do i have an eatting disorder? I mean im not worried of getting fat, i want to get fat to weight more...