There is a new Federal Grant available that's good for up to $4000 a year for many majors including languages. Check out the link and scroll to the bottom. The top of the page describes a new academic grant for high achievers graduating high school after Jan 2005, one which you may also be eligible for. (Note that the top grant is NOT the same as the bottom one...)
The link: http://studentaid.ed.gov/PORTALSWebApp/students/english/NewPrograms.jsp
Unfortunately, my state (North Carolina) doesn't offer Japanese as a major anywhere, but I figured you guys may have found this useful.