I think you could probably construct several mutually contradictory utility functions which would dictate lives you enjoy living. I think it's even possible that you could construct several which you'd perceive as optimal, within the bounds of your imagination and knowledge.

I don't think we yet have the tools to figure out which one actually is optimal. And I'm pretty sure the latter aren't a subset of the former; we see plenty of people convincing themselves that they can't do better than their crappy lives.