How should I quit my job after 3 days?

I'm a freshman in college; I just got here not even 3 weeks ago. I definitely bit off more than I can chew when I signed up to work 4 nights a week from 8:45pm-1:30am in one of the campus dining centers. It's only been three days but it's already seriously affecting my schoolwork and my mental health.... show more I'm a freshman in college; I just got here not even 3 weeks ago. I definitely bit off more than I can chew when I signed up to work 4 nights a week from 8:45pm-1:30am in one of the campus dining centers. It's only been three days but it's already seriously affecting my schoolwork and my mental health. Can I quit effective immediately over email?
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