If many worlds is true, you took all options of every choice (if we assume, as seems likely, a non-zero probability of your neurons firing in a way that actuate

If many worlds is true, you took all options of every choice (if we assume, as seems likely, a non-zero probability of your neurons firing in a way that actuate each option). But where does the "wanting" lie? What if it's an experience that is not physical, but real? I.e. it exists and experiences itself, but it does not in any way change our scientific description of the universe. It doesn't change how all of the many worlds are playing out. Would this "wanting" have to inhabit every branch of the unierse? Perhaps it only exists along the path of choices that it "wanted". Then everything that can happen, happens, but your consciousness only experiences what it "wanted". Mechanistic action and free-will are both preserved.