For me, that's actually pretty accurate. I have a hard time budgeting time, and a hard time being OK with "good enough," "done enough," and "accomplished enough."
The one thing that has helped me is to learn that it's not whether I have it all done or not that is of paramount importance. It's "Did I get the urgent things done?? Did I leave time to do the important things?? Is it MORE DONE than it was before??"
I have done better since I learned to accept that, at the end of the day, something will always be undone, and it will always have to be done again tomorrow. The important thing isn't clockwork perfection. The important thing is to do the next thing, and just keep doing.
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"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"