I'm glad that you mentioned that, because it reminded me of something. I frequently feel like an NPC, but I also get a truly vast amount of false alarms on my existential crisis meter for some reason. I mean, I know I've been depressed before, but even attempting to account for that, some of my internal thought processes feel ridiculous in retrospect. Let me give you an example:

"Life has no purpose, I don't care whether I live or die, everyone is going to abandon me when I inevitably fail."

Eats Food.

"Wait, I was just hungry."

I mean, that sounds absurd to type, but I really have had that happen.

I am not saying that your specific Existential crisis is a false alarm. (You may have already established that it isn't.) But there might have been other people reading who aren't aware that Existential False alarms exist, and your mention of being an NPC reminded me of that.

I am not sure what exactly you mean by that, but to me it seems that many people enjoy the idea of being an NPC. This is essentially what conspiracy theories are about: that someone else is the PC of this world, and we are not.

Yes, people complain about that, but they enjoy the complaining, and they strongly resist being convinced otherwise.

I had a conversation about this with my girlfriend last night, and what we felt it came down to was the feeling that it is frustrating to be an unfulfilled enneagram 4.