> I have no discipline of the superego variety— but when I realize I will let someone else down, I become motivated
I think that's superegoic, you're doing something because you should, and you'll beat yourself up morally if you don't. Rather than egoic, doing it because you want to for your own gratification.
You can look at it that way. I suppose another way to say it is that I can’t seem to get motivated about letting myself down, but I can about other people.