@Langoid Aren’t you still a sophomore in high school? If so, then you have a lot of time to figure this out.
Do you know what your budget is for university? Do you live in a state where the in-state public universities have a strong language program?
It seems to me that you should be able to find an affordable university that has a strong classics and a strong languages program.
As one example Bishops University in Quebec is strong in classics and very strong in languages (particularly French of course, but also Spanish and a few other languages, and has a combined French/Spanish major) and the total cost of attendance in US dollars for international students is only about $25,000 per year – and the locals in the area can speak to you in your choice of English or French. I am sure that there are some universities in the US that would similarly be strong in Classics and Languages. In-state schools might have an advantage in terms of being certified for teaching (if you have an appropriate in-state school).
If you decide to major in something other than languages, for many careers being bilingual or trilingual is a plus. As one example I know a nurse who tells me that being bilingual has been helpful in every job that she has gotten. She does have patients who do not speak much if any English.