When the “have to do” stuff starts to encroach on the “want to do” stuff, try to remember the following from Jon Acuff’s book Start:
1. Admit that you can’t possibly get it all done.
2. Give yourself the grace to accept that as reality, not failure.
3. Do things you can do with your full attention.
4. Celebrate what happens during Step 3 instead of obsessing over the things you didn’t get to.
5. Repeat as necessary.

Of course, one should never use this as an reason not to try to get stuff done.