I find it next to impossible to swallow the fact that life is not inherently fair.
I find it difficult to let go of past hurts. Same with stupid and embarrassing things I've done or said. Even if its long in the past and very minor, the thought of it still periodically comes back to haunt me.
Me too!
I would say, overall, it fits the Beebe archetype, where the "Demon" is connected with the function opposite the dominant, but in the same orientation; which is Fi.
So this is an inner sense of integrity and worth, that is unconsciously but strongly piqued especially by [perceived] attacks to the inferior perspective it is shadowing.
Firness, for instance, particularly for us, would stem from a dominant Ti perspective, of impersonal (technical) things such as symmetry. This is reflected on the humane side by the opposite Fe perspective, where we expect the same respect from others, and subconsciously stake our own sense of worth on it. When people don't comply, we feel attacked, devalued, and are just torn apart by "the injustice of it all" (unfairness).
This becomes
internalized, so thus generates a very negative Fi perspective, which becomes our "personal demon". We can't let go of the injustice or any other slight, or even our own genuine blunders, which seems to go along with everything else we're reacting to. Thus, also, guilt feelings, overly put off or feeling threatened by the moralistic posture of others, etc.
Beebe associated an ITP's feelings of "anger and rage and ambition and aggression as well as with greed and desire" tha"turns upon itself, morbidly; we are envious, jealous, depressed, feeding our needs and their immediate gratification...", as "a description of demonic introverted feeling in an introverted thinking type".