I love being a teacher, but there are a few things I would have liked to have done differently, or wish I considered:
1) Army. I joined out of high school, had a bad ankle and was discharged early. I still wish I could have had a career as a soldier. Maybe, knowing what I do now, doing college ROTC where maybe they would have given me more time to do physical therapy or something to improve my ankle instead of booting me after basic.
2) Law Enforcement. Teaching, the military, and law enforcement are the three main jobs I have wanted since I was a kid. I tried two of the three. I wish I had joined law enforcement at 21 instead of trying sales. I would love to be in the motorcycle unit and ride for a living :) . Now that I've almost finished my masters degree in education and I'm looking for admin jobs, I'm actually half thinking of changing altogether and joining a local police department (even though I'm 42, and I'd be 43 when this school year finishes).
3) Psychology. I wish I had worked harder to keep my grades up, and didn't give up after my first mediocre grade, so I could have got into a decent Ph.D. program in clinical psychology as I had planned. A related alternative would have been med school and psychiatry.
4) Nursing. An Associates degree can get you your RN and a well paying job. Then, get the BSN and MSN while working, and become a masters level psychiatric nurse or make really good money as a nurse anesthetist.