I was analyzing a nightmare, and asking, why did it frighten me? I think the root fear was people telling me "I told you so". For instance, I'm afraid of my mom being right about religion.
Why am I afraid of people telling me "I told you so"? I think because I want to be respected, and free. I fear that if someone tells me I should do X, and I do Y instead, and X turns out to be better, then they'll feel self-justified in their view, and they'll be able to hold it over me the next time they tell me to do something. If I go against them again, I'll lose their respect, if I haven't already; but if I obey them rather than myself, then I won't be free.