School doesn't really train. Training is only done with practical subjects like bookkeeping or accounting, some computer programming courses (not all, most of it in university is more "theoretical") etc. My husband's an engineer and it was his work-study jobs that trained him for that, not the coursework in all those subjects; you can't build a bridge or an airplane just because you know physics and the proper math. If you like to study you might want to look at becoming a professor, though nowadays one has to have real world experience for that usually too. What is hard about professions is you really only learn what they are by working several years in the field. It is hard, too, when one gets out of school because the real work world doesn't really care about the school stuff, like you said, there are people with astronomy degrees working in the automotive field. Going to school, one has ideas of what one likes and imagines what it is like based on that (what one reads, basically) but one graduates and a whole lot of stuff we don't know anything about get in there and shift things around. I didn't get to my "true" profession/life until I was in my 40s-50s.