You were eligible to work at 16. Go and apply for a job at your local grocery store, hardware store (if know something about hardware), pizza parlor, fast food, target, whatever is around you, especially those that advertise that they are needing help. If they don't advertise, ask for the manager and ask if they are looking, that you are looking for a part-time job. P.S. Save most of what you earn. You will need it for when you move out and are on your own. It will also allow you to travel and you can still be well dressed at school.
Certified Paralegal, with 25+ years' experience & I started part-time at a grocery store, at 16.