The very first thing I wrote (other than stuff for school) was an awful Warhammer 40K rip-off space marine SF novel, which got to 35k and mercifully floundered.
OMG, I used to love WH40k.

I played Tyranids. Munch munch.
What inspired me to write? I don't know, it's hard to say. What got me writing is an easier question. I was home all the time on disability, and I liked writing various things, such as battle reports for video games, and so I wanted to try a novel. That's what GOT me writing.
What inspired the original ideas? It's hard to say. Perhaps neurosis, or a means of coping with being in a bad place.
It's funny though. I realised I wanted to write long after pursuing virtually the polar opposite of physics. In high school English I had always loved the creative writing assignments. It just took until I was in a really bad place that I decided I wanted to pursue writing in the big leagues.
(As for those battle reports, it was Starcraft games

They really introduced me to writing on my own time, and taught me basic html, which I then turned into a website, gone now.)
Strangely enough, I had a comedy article published in my Uni's magazine. I was studying physics and maths, and I still wanted to write something, but I didn't stop and think, "Well, maybe I like writing more than I like science?" I do, by the way.
