[Fey]

First, putting out there that I didn't read what everyone else wrote, just what the author did.... So I probably repeated a few things, ignore as desired.

I know it's hard, specially at 14, but don't freak out too much. Yes, it's very hard to gain weight, just as it's hard to loose weight. But right now your body is learning how to function now that all the hormones are raging through it(yay puberty, NOT). You'll get to a healthy-for-you weight and your body will maintain it. If you absolutely want to gain weight talk to your doctor and see what he/she recommends. Typically they'll put you on a high protein diet with a lot of exercises. But, as you learned, just because it's called junk food doesn't mean your body will immediately store it up.

On a slightly odd tangent; I'm very jealous of your healthy diet and habits, so keep them up if only to be a very, VERY good example.