On the other hand, some people have too little structure, and are miserable because of it. I realized this when I had kids: structure didn’t make them miserable; in fact, it gave them a sort of calm, and reassurance, and clear expectations.
There’s a balance. The “key” part of OKR is important — find the most impactful, highest leverage thing to measure, and focus on that. If you’re a student, that could mean getting a good grade in a course that’s very important to you. Too many goals can be as stressful as too few.
When I was younger I was perhaps too far on the unstructured side. There were creative benefits of that, but the detriment was ratholing on things that ultimately weren’t very impactful.
Ultimately, you have to keep yourself in check. It’s important to have open ended, exploratory time with no clear purpose. It can also be helpful to have some clear, key results as an anchor.