I don't know what fulfillment would look like. Seeing the lives of other people, I never feel any sense of, "Oh, wouldn't that be nice." No envy. No motivation. No desire. No nothing.
Generally, I look at them and instead feel dread. Dread at what it would be like living their life. Like, show me the happiest person in the world and I'll pick their life apart as if they just encountered a black hole. This is partly why I keep my distance from people -- I don't want to drag anyone down.
These antidepressants are working wonders today. I beg your pardon.
Yes, I suppose it could be said I feel unfulfilled... But I don't care. Or maybe I do care, but it's buried under all this darkness. Can't see it. Can't feel it. Nothing.