A lot of great stuff already posted here, so I'll just give some practical short term advice in response to this:
With college looming...
Most colleges have an "undeclared" category for freshmen. This means you don't have to choose a specific major until sophomore or junior year, depending upon the college. So many majors have the same basic course requirements that it is very easy to do this without losing out on any opportunities, and it's a great chance to explore and discover what interests you. Even if you do choose a major right at the start, you can always change it, and most curriculums include a certain amount of elective credits, meaning they can be satisfied by any courses you like.
--Percy