When I was 14 I began playing a homebrew version of Dungeons & Dragons with a few of my high school friends. I was immediately struck by the fantastic creativity involved with role playing games, and I wanted to become a Gamemaster. As was not uncommon in those days, I created my own homebrew rules system and named it Elthos RPG.
I have a more detailed writeup on my blog here:
http://elthosrpg.blogspot.com/p/what-is-elthos-rpg.html