Coach of a football team.
Live out those aspirations I only simulate in Career Mode in FIFA games.
Actually that'll get boring because I know I'll win regardless.
So that said, I want a field where success is something needed but something where I'll always be surprised at the same time on how the success was achieved. So for this reason, mathematics. I'll be like "I want to prove the Riemann Hypothesis" and then BAM! it'll be proved or disproved and from the proof, we'll learn many, many, many things.
Or so I hear.