That's not how it happened with me.
I didn't want to be a writer. I remember Twin reading Dear Mr. Henshaw in elementary school (I think she read it multiple times) and I always thought it was kind of dumb. A kid who wants to be a writer and so he becomes pen pals with an author? Boooooring.
No, not for me. I wanted to be a veterinarian.
And when I was even younger I wanted to be a veterinarian and a singer. Of course my parents then teased me, asking me if I would sing to the sick animals which, naturally, drove me crazy.
Now when I think about it, that's actually kind of a clever idea. It would be awesome if there was such a job, where all you had to do was sing to the sick (animals or people) and they would be healed. Though stuff like that has pretty much been done to death
But then I hit high school and the aforementioned fan-fiction. When I did NaNoWriMo for the first time in 2009 I noticed that on the website and in the book they constantly talk about how, when you've become a winner, it could possibly the most you've ever written! Well, barring the fact that my previous WIP was stalled at over 70K word, I spent high school writing elaborate fan-fiction stories with my friends, the longest one over 40K, though there were at least three others that capped in the 30K range. So you can see I spent much of high school writing a lot of fan-fiction. Word count was not an issue for me.
Fan-fiction was fun. Of course, the majority of it was that it allowed you to fantasize about fun and exciting things with your best friends who were also involved in the fan-fiction. But the writing was fun too. I began my very first writing notebook where I stored ideas for fan-fiction and other stories - my Puppy in the Pot Book.
Also, I began to do very well in English class. I mean, I guess I had always done well in English, I never got bad grades in anything, but in high-school I began to enjoy doing well in English. I still loved science (especially biology), but a few great English teachers began to steer me away.
When Twin and I went to our orientation for the University of MN, one of the first things they ask is what you want to major in, so they know where to send you during the orientation. I was all prepared to say "pre-vet" like Twin, but instead what came out of my mouth was "English".
It was then that it was finalized, well at least the English degree idea. I still didn't have any plans of wanting to be a "real" writer. My original idea was to become a high school English teacher (something I still kind of wish I had followed through on).
But then, around my sophomore or junior year, I realized with an English major I could have an emphasis in creative writing, and well, that was it. My senior project wasn't a big paper on an author, instead it was a lengthy short story. All my electives were fiction classes and solidified my desire to be a writer.
So there you have it. Had you asked me when I was eight if I wanted to be a writer, I would have laughed in your face (Twin would have helped). If asked when I was 18, I might have hesitated and then said no. But here, when I'm approaching 29 (omg 30 is on the horizon...), well I've been saying it for almost a decade. It's kind of a weird little path I wandered.