I liked the idea of making games as a kid. Once I got my first computer at age 12, I picked up some skills like programming and music, and I'd type up gameplay/story ideas. I became a little more inspired once I read about how other big game devs picked up their skills in their childhoods like I did, but overall I wasn't very motivated.
Even now I haven't finished much. Despite pushing 30 I've only finished a couple small puzzle games, one being a Tetris clone and the other being based on another anon's design. And lately I've begun to learn why I wasn't very motivated as a kid. I've been reading up on child abuse and neglect, and it's driven me to look back on my own childhood and realize just how bad it was. Kinda hard to have motivation when you hate yourself and everyone else seems to hate you too. I mean, I had a hunch growing up that something was wrong, but I just thought I was too weak to handle it. Now I know better.
I'll still get driven to work on something on occasion. Though at this point I think it's out of some desire to seek justice for the kid I could have been, rather than just making a game for its own sake.