<human>: Can you succinctly summarize the text in 1-3 sentences?

Throwaway since some of my friends are Redditors. 

As a college student trying to have a nonzero amount of money to work with, I looked for some part-time jobs and actually managed to find one. The pay wasn't stellar, but after I did some math, I found out that this job would push my monthly earnings just slightly over my expected expenditures, meaning I can pay off my tuition, have food on the table, cover my monthly bills, and have some left over to put towards my savings. Wow!

I was of course ecstatic, and signed up for shifts as often as I could, working my back off every day and earned a constant stream of merits for the first two weeks. Time came for new hires to sign into a permanent schedule and I jumped on the opportunity, requesting a large number of shifts in my free time. After I submitted the form, I realized that I would also be free on Saturday afternoon, and went to request a shift at that time. 

Unbeknownst to me, this caused my previous requests for >10 shifts to be overwritten by a single request to a Saturday shift, which I found out today (a week after the fact) was denied because my schedule now went under the 6 hours per week requirement. The supervisors were sympathetic but could not do anything about it as it's now past the sign-up deadline. So now I'm sitting in my car with my income slashed by over 60%, pondering which deity I pissed off, and desperately convincing myself that my emergency fund will last until I can find replacement income.
<bot>: My negligence in not double-checking on the status of my job just reamed myself in the ass with the fury of a serrated dragon dildo coated in hot sauce.