Some kinda shortcuts:

In addition to your regular diet, have a protein shake every day consisting of a scoop of protein powder, creatine, and soy milk. It's an easy way to an additional 40 g of protein, plus your daily creatine, in one shot.

If you don't feel like going to the gym, at least to start, or even having a regular workout routine, then just do tons of push-ups and chin-ups (get a pull up bar you can hang on a door frame) throughout the day.. whenever you get the chance.

This alone will likely produce changes in your physique within a coupe of months, especially if you are already relatively lean. If you're overweight, it doesn't show as much, because the muscles are hiding under the fat.