I like @worriedmomucb’s idea of doing some work at a community college as your “gap year” experience. As you’ve done a fall Saturday school in Philadelphia, I will assume that you are from that metro area.
Community College Options
Doing this would give you some extra experience that could meld well with a career in music business, but would not necessarily be a ton of overlap in the course requirements. And this program indicates that it also offers internship opportunities, so it may be a way to work around age minimums.
Other possibilities could be:
Must be in the Music Performance AA program to complete this one:
Volunteer Options
Alternatively, if you’d like to find some volunteer experience, perhaps one of these organizations might be a fit?
This one specifies ages 14+
https://manncenter.org/volunteer
(As this organization indicates that background clearances aren’t necessary for youth volunteers, I’m assuming youth volunteers are allowed.)