You should probably see if you can find and talk to people in the professions you think you want to follow. Your idea of what an astronomer does made me smile a bit; one of my good friends is an astronomer and worked at the Naval Observatory in Washington, D.C. 25 or so years ago and since then has been working at the National Science Foundation (NSF). There is some part of every job that is cool, like imagined but most of it is day-to-day stuff, like the rest of life :-) You have to really love the day-to-day stuff and think that's fun to do well in a particular profession, not be able to stay away from it even when it is combined with stuff you don't like like customer service and sales, LOL. I hate data entry, for example, but had to build a 2000-record database from scratch for my research project that took me the last 3-4 weeks full-time and being excited and wanting to see what the data would tell me for the paper I had to write up kept me at it eagerly. My astronomer friend has had to judge school science fairs and present papers, do "glad-handing" (basically, sales :-) and lug around heavy equipment ("portable" atomic clocks -- about twice the size she is :-) and do the upkeep on mundane charts/statistics and the actual stars are few and far between. What we see in the media, Neil deGrasse Tyson's "Cosmos", is not what most astronomers do.