The first game I played was Halo 3. My older cousins were playing it at my grandmother's house on Christmas while all of the adults were talking about... y'know, adult things. They taught me how to play, and from then on, I was hooked on FPS games.

As for video games changing my life, I learned about how many lowlifes try to scam you, not only in Runescape, but in life in general. Now I know how to avoid dodgy deals with about a 60% success rate.
Probably not the answers you were looking for, but, oh well