Every time you ride it you're work hardening the metal, though, if that makes you feel any better. Sooner or later, fatigue will be an issue, and it'll break. You've probably got another 11 years before that's an issue, though, depending on any number of variables.
Make sure that every few months you clean it up real nice and inspect it for cracks. That's about the best you can do. With a little luck and a sharp eye, you'll catch the crack before it breaks. Not that you can really do that much about the crack when you see it, but hopefully you see it and won't get stuck with a broken bike out in the middle of nowhere.