background: I'm having a two semester long internship with a local small (only 2 formal employees including the boss, and the rest of the 10 people are all student interns like me) financial consulting company. I told them that I'm willing to work 18 hours a week every week during this semester. However, I didn't realize that my classes this semester are hard and I have to put in more hours for studying. I speak to the boss last week asking for reducing my hour to 12 hours per week and she literally insulted me because of this, saying that I'm breaking my promise and she refuse to do so. The work I've done so far are scanning documents, preparing mails and checks, and simple data entry to excel sheets, which I do feel is a waste of my time. Also my boss, as you may tell, is very emotional and demanding. The problem is I'm also trying to find a summer internship next summer and I feel that it will be consider bad to quit an internship within a month, but I really think that I can use these time to do things more useful and relevant to me.
I'd appreciate any ideas/opinions on whether or not I should quit my internship. I don't know how to address this to my boss neither, as she is very emotional and irritable. Thank you :)