Align yourself with your potential. Don't sell yourself short. You are capable of way more than just band.
If you can, live with your parents again or cheap apartment, if possible, start fresh into a new major or community college and part time job, or even the armed forces could give you a fresh start if you are up for the physical challenge.
It's not too late for you. Your experience with band was just a chance to get to know yourself better...now you know, your alignment is elsewhere, it was the friction before your great shift. Go get it! No regrets!