Allow me to change my status from "innocent bystander" for a moment and through my 2 cents in.
Listen to what Rip and Paul are telling you. At 19 you probably don't appreciate the opportunity that you have - I didn't when I was 19. If you really try to you can figure out how to eat more. The work isn't only eating more it's figuring out how to be able to eat more. I remember reading stories about Rip and his friends raiding buffets. You can figure out a way if you get creative.
You want to get a strong as you can right now so that you'll be stronger when you are old and your body tries to turn what you eat into fat and ear hair instead of bone and muscle.