Eating disorder, or what?

I'm an 18 year white male, who weighs ~119 (give or take a lb) lbs, and I am 6'3" tall.

I have been skinny my whole life, I used to chalk it up to my metabolism. I ate a lot, on par with some of my larger friends, yet I stayed skinny. While I was skinny and eating properly, I would say I was healthy. I never lacked energy, was always attentive, things like that.

In the past year or so, my desire to eat anything proper has disappeared entirely. Before this started I weighed about 129-130 lbs, and I was about the same height. I may have been 6'2", but regardless I was still tall. I can't put my finger on exact date this occurred, probably because it wasn't an overnight thing. Everyday I started eating less and less, opting to put up with the faint hungerness feeling rather than eat. Only when I am extremely hungry does my stomach ache for food. I see food that used to make my mouth salivate, and I think "oh yay..food." The taste has no appeal to me. The texture has no appeal to me. I have probably 1 proper meal per day. Proper meaning I get all nutrition I need from the meal. The rest of the day I'm either not eating, or I am just munching on things like chips, cookies, etc. Even then it isn't for long. I think the best way to put it is I am really hungry, but I have no appetite. Normally when you're hungry and you see food, you jump on that and get down to business. For me, I just ignore it because I don't feel like eating.

I am aware of the fact that I am skinny, and I have no desire to remain skinny. My whole life I have made a goal of gaining weight (to a healthy level, 180-190 in my mind), and that hasn't changed at this point. I am just unable to attempt my goal because I have no desire to eat.