yeah looking back, I do feel quite dumb with how little I've been eating, considering my age and how much I should be getting for adequate growth, etc. I've always eaten pretty healthily just never enough,Calories dude. I eat more than you and I'm 40 years old. Eating healthy foods means eating more volume.
I train a kid that's 19, and his hairline is receding. He is obsessed with getting a "six pack" and never wants to eat. Bump your calories up 100-150 or so a week, until you get closer to 3000. You can halt the loss, and likely make progress since you are addressing it early.
thanks