Don't ask me what I want to be when I grow up. I'm only 39 :)
Early in high school I planned on a military career. When I started college I figured on physics, or chemistry; some respectable science career. Along the way I got paid to program, and became hooked; everything I've done since has included programming, though it wasn't usually my job title.
I had a moment similar to your fence digging epiphany, while working at a steel mill. Watching the guys climbing around on machines that were rolling bars of red-hot steel made me realize that writing and programming are really good jobs :)
I've been a programmer for what, 19 years now, but I find it funny that I never considered it my calling. For a long time I wondered if I'd missed my calling (I used to joke that it saw me coming and ran away). I'm not one of those "programming is just a job" types; I program for fun and write about it in my spare time.
Maybe finding your calling is like finding True Love. When I stopped looking for a relationship, one found me, and now I'm married with two kids. I hope that doesn't mean I've grown up though -- I still don't know what I want to do then :)
I'm thankful for my job too. It lets me pursue other things, including parenting, the latest, most wonderful challenge and the most satisfying to date. Thanks for posting this reminder.
In reply to Some are called, some just drop by and stay for life