If there was absolutely nothing that subjectively bothers you about the current state you're in, you would not act at all
Why not? The obvious reply is that, even if there is nothing that bothers you about your current state, you might still be motivated to act in order to move to an even better state. In any case, your attempt to make sense of the example from a negative utilitarian framework simply doesn't do justice to what people take themselves to be doing in these situations. Just ask people around (not antecedently committed to a particular moral theory), and you'll see.
Introspection is not particularly trustworthy. If you consciously (as opposed to acting on auto-pilot) decide to move to "an even better state", you have in fact evaluated your current conscious state and concluded that it is not the one you want to be in, i.e. that something (at least the fact that you'd rather want to be in some other state) bothers you about it. And that -- wanting to get out of your current conscious state (or not), or changing some aspect about it -- is what constitutes suffering, or whatever (some) negative utilitarians con...
I've always been more of a theoretician, but it's important to try one's hand at practical problems from time to time. In that vein, I've decided to try three simultaneous experiments on major Less Wrong themes. I will aim to acquire something to protect, I will practice training a seed intelligence, and I will become more familiar with many consequences of evolutionary psychology.
In the spirit of efficiency I'll combine all these experiments into one:
She's never seen Star Wars or Doctor Who.
She's never seen David Attenborough or read J. L. Borges.
She's never had a philosophical debate.
She's never been skiing.
Never had sex, never been hugged or even been licked by a dog!
She has so much to look forwards to...
(Though she'll be very boring for several months yet!)