I'm 17 years old and working my first job at a pizza place to save money for college. I agreed in writing a few weeks ago that I'd be available to work until the 12th of August, but due to a terrible work environment I've decided I don't want to put myself through it anymore. I'm not sure how to explain this to my employers, and I'm worried that they'll consider me unprofessional and I'll lose their reference for future jobs. Is there a right way to do this?