From the time I was very, very little, I would make up stories and try to turn them into books. Before I could write, I would draw pictures and then ask my mom to staple the pages together so I could tell the story. My stories were always about everyday life, not "Once Upon a Time" fantasies, which is something I find interesting - it's the earliest hints of my style as an author. I remember one "book" in particular I made that was about funny things that happened to my brothers one day. It started with them getting up and falling out of bed, and then tripping over their messy toys, then falling into the toilet, etc. That was before Kindergarten and I believe my mother still has it stored somewhere. My mother ran a home day care, and for years I used to sit with the kids and have them volunteer random things, and I'd turn them into an improvised story.
There's never been a time in my life when I answered "What do you want to be when you grow up" with anything but, "A writer." (Although now that I am a business writer, I sometimes refine that into, "An author.") For a long time, I honestly thought everybody came pre-programmed with what they were "meant" to do, and it was strange for me to learn that that's not the case. My kids have wanted to be everything from a surfer to a doctor, and it's hilarious and different for me, because literally my entire life has been built around this core of needing to create stories, and never wanting to do or be anything else.