I have often thought the same thing. Love being outdoors, working on cars, etc. Problem is, I never figured out how to make a living doing that.
I read something recently that the idea of "find the job you love and do that" is really a crock. The reality is that most of us slog away doing jobs that are less than ideal but that is part of being an adult. Just not too many opportunities like that guy that got hired to oversee that Island in Australia. To be honest being a Pharmacist isn't a bad deal. Decent hours, interacting with other people, helping people, and a good salary. My brother in law is a pharmacist, runs his own business and does very well. That gives him the time and $$$ to do the things he loves which is playing (a lot) of golf.
Sounds to me like you have your head on straight, and are having the same questions that many of us to. Sadly, there just aren't that many opportunities to care for and exercise Jay Leno's car collection.
Personally, I have been in the Army for almost 30 years. I have loved many aspects of it- working outdoors a lot, working on mechanical stuff (pulling howitzer powerpacks in the mud), and such. But it isn't for everyone
Good luck!