You'll need to have taken the GED to take classes at a public community college as a non-high school student in Tennessee at age 16, and the ACT is also required for everyone under 24 or so.
As a high school student you can do dual-enrollment. Homeschoolers are not generally eligible, but those attending an umbrella school are. The state will then pay for 2 courses as part of the Lottery law, but more than that they require you to apply for Federal Student Aid, which will whittle away your lifetime eligibility which generally is only going to be for 4 years total, and you probably want to save that for real university which costs a lot more. The state claim that they have free community college is not really true, it's a scam to route federal grant money to the state, while destroying your lifetime grant eligibility.
I recommend you take online classes and self study in German and French. There's also sites where you can practice and chat with people who speak those languages who want English practice. Then take the AP French and AP German class, which when you pass will mean you can convert that self study into actual college credit, all without paying hardly anything (testing fee about $95 each class).
Also, take this linguistics course as an intro: https://www.coursera.org/learn/human-language
Then get a good linguistics textbook and start reading, plus trying to decipher linguistics papers and books. If you can read those papers at all, you know linguistics since it uses about the most technical and opaque language of any field.
Also, since you're past 9th grade there's no longer any state testing requirement so you don't really need an umbrella school.
Good luck, should be much more fun for you.