As for the drudgery of University and crappy assignments- what, do you imagine "neurotypical" people love to do banal assignments that are below their skill level? Everybody hates make-work.
The risk with all this is that manic depression, ADHD, etc are mostly an extreme form of things we all experience, so it's not hard for people to convince themselves they have it.
As for finding enjoyment- University can be a slog. But I found once I had climbed high enough (and managed to drive myself to do the un-fun parts) it became rewarding. The thing is a lot of school is building foundations; the fun part comes later. That said, if your major is completely un-fun, you should reconsider your track. E.g., as much as advanced math was a complete chore for me, I knew I loved to design circuits, and I tinkered with them through all of University.
You haven't known "God, I wish I was doing just about anything else right now" until it's June, sunny, and 75 outside, and you are sitting through a four-hour-solid lecture on linear algebra. But it was worth it.