Agreed. It's all so repetitive - work, eat, see friends, even travel gets tiring. I felt this way in uni and that's why it took me 7 years to graduate (ended up taking 3 years off to try to "get well mentally" but it never happened). I've always presented as very well-adjusted, emotionally stable, and intelligent even in the darkest, most trying moments of my life. I somehow managed to graduate with high distinction from a prestigious university, and my then psychiatrist, doc, and therapist all had so much faith that my future had promise, no matter how many times I told them how much pain I was in and how death felt like the only decent option. I later read my psych's notes on my medical chart and saw that he wrote "patient is no longer presenting symptoms of mental illness" around the time of the pandemic, when I was literally the closest to death I'd ever been. It's laughable. Something I always come back to is how adamant everyone was around me at that time that things could/would get better for me. I wasn't hopeful at, but I took their advice, stuck it out and started working full-time. And proceeded to feel just as crummy, if not more.
Not saying that things won't get better for you before/after you graduate though, especially if school is a major contributor to your pain.
yeah prison is the word I'd use for it too. Pretty much nothing is thrilling. I am, however, constantly surprised by how much worse it can get every day