I've noticed myself doing things like this, and I think the root cause more than anything is an inability to say no. If you're getting other things done but no

I've noticed myself doing things like this, and I think the root cause more than anything is an inability to say no. If you're getting other things done but not some particular task you've agreed to, then that's probably a good indication that the various subconscious processes in your mind have come together and deemed it unviable. These processes evolved for a reason and shouldn't necessarily be ignored (at least, not usually!). Rather than tyrannising yourself into completing every single task asked of you, I think a much healthier way to approach this is to simply stop and ask yourself whether or not it actually makes sense for you to do something before you agree to do it.