Hi, Im A 20 Years Old Male And Im Underweight.

Hi, im a 20 years old male and im underweight. Im 6 feet but only around 135lbs. The problem is that I dont get hungry or feel very hungry until im basically craving for food, when I do eat its pretty decent portions. Im not afraid to eat or anything Im trying to gain weight but its hard to force myself to eat when Im so far from being hungry it just feels sickening to eat. They tested me for thyroid problems when I was about 15 but I was fine. Anything I can do or try? I want to fill in so bad and I need to take in more calories, but its hard when my body doesnt want to.