im in 10th grade lol

but i want to study it when i go to college. i just have way too much time on my hands and i picked up a fun-looking book one day thinking it would be a quick, interesting read... it was a linguistics textbook lmao
i just read about it and study online, but im glad you think i have information
there's lots of fields of linguistics that focus on language throughout history and how they affect each other! diachronic linguistics, ethnography of communication (not directly stated by you but very very related), and linguistic anthropology!
you may also like philology and etymology
linguistics is so cool because things as small as the vowels used in different words or the word order can affect our brains and our perception of the world around us
for example, in english we call two different shades of red different colors- red and pink. even though pink is just light red, we specify it, and that distinction has been proven to make english speakers better at telling apart different shades of red. the same is true in russian, where they have a separate word for light blue, and can tell blue shades apart better.
also, in english we place a lot of emphasis on the subject of a sentence. it cannot be dropped (which leads to some weird phenomena like saying "it looks dark outside"... what is "it?" such an abstract subject) so we often remember better who did an action. in japanese, the subject is more often than not implied, so they have a harder time remembering who did an action. ex: an english speaker would recall "ahsoka broke the window" while a japanese speaker would recall "the window was broken."
simple things like these affect the thinking patterns of a society and can affect, subtly or not, the choices made by the speakers of those languages, which is super interesting to look back on in a historical light- like what decisions made by rulers reflect aspects of their main or native languages yk?
so cool!!! sorry for the rant lmao