Earliest recollection is to be a fireman. I had a Texaco fireman's hat and one of those big Texaco toy firetrucks. Only trouble was, I was deathly afraid of fire, so that was out. Thought about being a cowboy, until my dad said I was born too late. Astronaut was in there somewhere, and pro football player. In middle school, it was to be a pro bowler on the PBA tour.
I didn't really have any clear idea, though. In high school I was thinking about the military and hoping to qualify for an interesting field in the Navy or Air Force and learn something I could then use in the private sector, but my parents weren't keen on me going.
It wasn't until I'd worked in the Postal Service for a decade, mostly in the training department, that I realized I had good people skills and communication skills, and really enjoyed the HR field. So I didn't really grow up until I was 35 or so.