Like any stereotypical young (READ : UNDER 13) person who was into racing, I got into it by Gran Turismo. 'Course, I was also a wimp back then too (as a driver, anyways) because I don't use manual back then. I also played a bit of Sega Touring Car Championship (PC) and Daytona USA (the strange and obscure PC port).
The rest, of course, is unremembered.