There is a delicate balance between what the author of Reboot Jerry Colonna describes as 'Foolish Grit' vs. 'Healthy Drive + Ambition'. In my own experience I find it helpful to enquire into the underlying motivations for the work.

i.e am I driving myself from a place of fear? How does my body feel when I begin working on this? What is the source of the resistance? Whilst fear can certainly be a powerful motivator in the short term, it is not a sustainable fuel source.