Go to the career center to see what type of job is ‘you’. Go to the library and borrow /to the bookstore and buy, ‘Do what you are’.
At some point you’ll have to be employed; if you want to be self sufficient you have to figure it out, now, while at Penn. And if you don’t want to earn 25k a year cobbling together a few hours here and there as an adjunct teaching composition or whatever they ask you to, then you need to start thinking now. As for feeling sad about classmates graduatung, well, how do you think you’ll feel if you’re not employed and stick at home? Your classmates are the ones who pushed you to consider your career, they’ll understand it if you need one more year to get skills alongside your knowledge. Think about classes you could add to your resume, or fields you could be interested in (I listed a bunch) and what you need to do to get there.
Since you’re not doing anything this summer, make an appointment and schedule time at the career center - if it’s a car ride or train ride I don’t see how you can NOT do that actually.
I can assure you that MANY interns’ job is not to sit around and fetch coffee.
Are you not interested in museums, art, auction houses, forensic science?
Even if your goal was to go straight to a PhD, your summers would have been a problem. Each summer after sophomore year on is supposed to be dedicated to something - if not an internship or a project, work. It has to be something productive you can put on your resume. So, start with the career center
BTW you’re not serious about mcDonald’s. If you were, you’d know about wage increases at Walmart. However, yes, if there’s a job opening at McDonald’s in your village, go and ask for 10hours, or Walmart or whatever there is. Use that as a starting point of what you don’t want to do and why but also as a way to see what you’re good at, to find at least one aspect of the job you appreciate.