The university I went to told us not to bother with unpaid internships, because it’s just a sign the company doesn’t care about you. Paid internships pretty much always still give college credit.

Most of my coworkers can barely make it through their own tasks without fucking something up

This is a problem with the company you work for, not your coworkers. I’m sure if they were paid more, were given more agency, and received better training, they’d be better elployees