I think it's certainly a part of aspects that relate to many issues that include OCD.
I was reading my new book earlier and funnily enough, this was written by (not someone mentally ill) but a logical genius, and she said "I have to go to the gym for 5 mins, that is all. If I leave AFTER that 5 mins, I won't feel guilty". She then goes to gym, and then has choice leave at 5 mins and not feel guilty, or stay slightly/ or much longer and gains the benefit of the gym.
I had a second chance at studying a few years ago, and what you wrote there, is exactly what I did, and I ended up quitting. I just couldn't cope with the guilt of doing something I enjoyed, because I felt I should have been studying.
What I read earlier, what you have said, and my little story are all connected in some way. It's obvious.