I have been slim real slim my whole life I got one fast metabolism im 6'4" and I weight like 122, im 21 so yea drinking has not worked either. I eat regular meals and I am just as if not more healthy as other people I just want to gain some weight... any advice??
Some people are naturally inclined to be thin... I'm 6'3 and I was thin for a long time so I know what it's like. I was heavier than you, around 140 I think, but then all of a sudden I just started putting on weight and now I'm 180. Eating a lot definitely helps, protein I think and lots of carbs.