Quitting job first week

It sounds bad but listen and please comment your opinions.

My job has me working 56 hours this week with one day off being Wednesday . I’m the new kid and the one with the most hours. 8 other people have on average 28 hours and 2 work only one day. I am 19 and taking 15 hours worth of classes for college and dead week is this week. Also another thing happening this weekend is my best friends wedding (which I’m in and has been planned for nearly 2 years) is on Saturday. There is no way in hell I am missing my best friends wedding for the world.

My manager said “the schedule has already been made. You cannot ask off without two weeks notice. That schedule is final. If you don’t show up you will be terminated,”

My first day was last week on Wednesday. I mentioned in the interview on Monday , stated verbally and text that I needed Saturday off. This job is supposed to be seasonal part time for me. (Even stated on the application advertising post and promised ) ... it’s dead week (week before finals) , finals next week and I have winter courses. I cannot be working 40 hours a week plus 16 hours over time. I’ve worked jobs while being a full time student and I’ve made it work.

I told my mom and boyfriend about it. My mom told me to just finish Tuesday , Thursday and hand in my uniform. Boyfriend said don’t worry about working but for mental health drop the job and focus on grades since I’m one semester close to graduation.

Update: I’m walking in tomorrow to drop off my apron and badge. No one knows I’m quitting just gonna walk in and leave.