Speaking from a scientific aspect, it should be easier for you. You have less weight to carry, less gravitational pull when jumping and crawling, and less wind resistance when running.
Edit: And I envy you. I wished to join the military, but was rejected because I have debt... Wtf is that all...
I play free games online a lot, and they always put the game in some stupid little 5x5 box. Even though the option isn't immediately there, (i.e., click here for fullscreen), is there a way to turn those tiny windows into full screen?