When I was little, I wanted to be Batman, Superman, Indiana Jones, a paramedic, a police officer, a doctor, or a vet.
Well, I'm just about too young for the last three; I'm not a guy, so that eliminates the first three; I'm also not from Krypton, so that eliminates Superman again.
Not a paramedic yet, but I will be soon, so EMS in general was the best fit. Not to mention that it's a damn good job for a college student.