I've been studying italian for 7 years because I basically had no choice (only lingo offered) and I realized it's completely useless unless I want to study art history or eventually plan to live in italy (nay and nay).
So I want to take French and if at all possible, Chinese, once I get into college since I need French in my future desired career and I have a desire to speak Chinese. But all of this applies if my future school offers those lingos.
My point is, why studying something you're not interested in?
I hear Spanish is very useful in the business world since there is a whole Latin-American market, but if you're already pretty good in it, why not try something new? You can always refresh your memory if you need it later in life.
Posters above had mentioned that learning a language in college is very much possible and that Chinese might be the next important language to know in business world. There's also a saying "The more languages you know, you worth more."
Could you talk about it with your (college) counselor or someone who knows about careers?
Or if you want to wait until you start college, would it be possible to talk about this topic with your college adviser once you start signing up for classes?