I had a teacher in high school (in his mid 30's at that time, I believe) who had switched jobs 7 times in 7 years. He was also one of the coolest teachers I have had, and is still teaching at that school (As of two years ago, at least. I don't know when he retires).
He was a Mechanical Engineer, a writer, an NFL referee, and through various job changes ended up teaching at that school. He didn't regret his job changes one bit, and I think it served him well. While he was teaching, he would sometimes travel to referee in an NFL football game.
He took the MBTI and tested ISTP (I was told by another teacher), but I think a little exploration of careers, early on, is a good thing for any type.
I don't think anyone would have "typed" him to be a high-school teacher (taught "principles of technology" and "engineering professionalism"), but that's where he ended up and he is good at that job too.