Me too. I'm a 63 year old Emergency Physician. I hope you haven't given up reading these posts yet.
Everything said is sage advise.
But. When I was your age, the oil field was a great place, albeit dangerous, to make money. It kinda hit the skids a couple of times over the next 40 years and is now a great opportunity, again. No body except my Dad, who was an independent geologist, predicted that at the time, and he didn't know nothing.
It doesn't matter what you choose to do/train for, 99% chance you will do something else by the time you can slow down enough to catch your breath. Your best bet is to:
1. Learn everything you can, then nobody can fault you for not knowing something.
2. Learn it the best you can, then if it doesn't come out right it is because you chose not to do it right.
3. Learn what the teacher has best to offer. Don't expect to learn how to run a lathe from someone that never has.
4. Be adaptable. Learning is adaptation and mastery, not necessarily interest. Every career has things that you have to do every day that are NOT interesting, but have to be done.
Dave, wishing you the best on whatever you choose.