We experience all sorts of passing and possibly conflicting impulses or wishes upon which we don’t necessarily act, and to which we never commit ourselves. It would not be appropriate to call these things that we “really” want.
Really wanting something implies what Aristotle would call a choice. This does involve a kind of ethical commitment. As Aristotle and Brandom might jointly remind us, to choose something is also inherently to choose whatever the realization of that thing requires; to choose what follows from the realization of that thing; and not to choose anything else that is incompatible with any of these. That is why Aristotle associates choice with deliberation. Just as emotion and reason interpenetrate in feeling, really wanting something implicitly has a rational and normative component as well as a desiring component.
Of course the possibility remains open that in particular cases, we may be unclear on what we want. In this case, we are back in the territory of wish and impulse. There is still some responsibility even here, but it is shared with others, and generally also matter for forgiveness. But as talking animals, if we explicitly say to someone that we want something, we are in the realm of choice and commitment, and we are responsible to be able to explain ourselves. Our participation in the universal community of ethical reason lifts organic desire into a defeasible rational desire. (See also Unity of Apperception; Dialogue; Scorekeeping.)