I just looked at your character on lodestone, you're definitely below the average item level. Average item level includes all items equipped, weapon, armor, and accessories, so the combined average for what you have equipped (according to the lodestone, anyways) doesn't meet the requirement, what with most of the gear being below item level 43. There should be a number following a strange symbol when you register a gear set, which is the average item level for that set, as well as that number being displayed on your character view in the character window.