Don't forget, too, that library science can translate to working in archives.
True, although this is mostly government or university archives with broad holdings. Some public libraries do have archives, but they don't always have a full-time paid position that manages them.
Archivist, Curator, or Conservator are really three related career tracks. If you work at a small institution - often with a collections staff of one - you will need to wear both the curator and archivist hat, but curatorial training is generally valued over archival training. Except for large organizations or government entities, conservators are usually working for businesses that get contracted by museums to work on specific artifacts.
Cultural Resource Management - archaeology - is also something to consider.
Yes, although this rarely involves military history. Unless you get a position with a specific historic site with a large enough staff to have its own archeologist (rare), It's probably 75% Native American sites and 25% civilian historic sites.
Archaeology doesn't involve as much field work as many people think. Archeologists tell me for every day in the field there's a week in the lab processing the artifacts and producing the associated paperwork.
Archaeology digs often need volunteer labor so there are lots of opportunities to experience some of the work first-hand.
The archaeology field used to be almost exclusively men, but this has changed substantially in the last few decades. The field school at my site last year was at least 75% women.
One last thing: if your high school has a JROTC program, think about joining it. I guess the bottom line is that you are looking to enter a field that is very small. You need to make yourself stand out from the crowd.
JROTC is a useful track towards ROTC, which can pay for college. Then after your military commitment you have Veterans Preference which is a huge asset for getting a federal government job, especially in NPS.
However, depending on your instructors, JROTC may be of little value to anyone not pursuing military service. I spent 4 years in JROTC. Had I been a juvenile delinquent or otherwise typical troubled teenager Sarge would have probably done me a lot of good as he did for my classmates. However, he had no more of a clue how to deal with a checked-out and underachieving, but well-behaved teenager any more than my other teachers or my mother. I still don't know where to find the kind of mentor I needed back then.