Callum Reid spent eleven years as a structural engineer before he knew what he actually cared about. Not a detour — eleven years of competent, salaried, unremarkable work, the kind where you get good at the thing and still feel like you're waiting for the real thing to begin.
Mission isn't a starting condition — it's a thing the work eventually secretes, the way a problem you've lived with long enough starts to feel like yours. You cannot see the calling from the entrance. The entrance is just a corridor; it looks like every other corridor. What you can only see from inside a field, after years of accumulation, is which problems are genuinely unsolved, which constraints are arbitrary, which accepted solutions are embarrassingly bad. That visibility is what converts competence into direction. Nobody hands it to you at orientation.
Charles Darwin spent five years on the Beagle not looking for a theory of evolution. He was doing the smaller thing — collecting, cataloguing, observing — and the larger question assembled itself from the material he'd accumulated by being somewhere most people weren't. The pattern only became visible because he had gone deep enough to see it. He couldn't have planned for what he found. He could only have planned to go.
You are probably somewhere in the middle of your version of Callum's eleven years, and the most corrosive thing you can do is treat that position as a failure of vision. The hour before a project review when you notice something in the work that nobody else seems bothered by — a recurring friction, a gap that keeps reopening — that irritation is information. It is closer to a calling than any career assessment you have ever filled out. The question is not what you want to do with your life. The question is what problem, visible only from where you now stand, will not stop bothering you.
You cannot plan your way to the frontier. You can only go far enough in that the view changes — and then pay attention to what you see that you couldn't have seen before.