While everyone is trying to lose weight, I'm doing the complete opposite

It's amazing to see how people lose weight after undergoing a set of routine exercising programs and dieting methods. I also have my own workout routine and eating habit. Both are geared toward weight gaining. I really believe if I'm eating right, rest well and exercise regularly. I should be able to gain and maintain my weight. As it turns out, I do not feel any stronger. Next time I should take a picture of myself so I know what's before and after :S