The idea that there's an infinte number of universes with a (smaller) infinite number of yous is silly, if you understand what's actually going on.
The multiverse isn't made up of universes where someone had toast instead of cereal, but rather universes where gravity is a little stronger, or water's melting point is lower, that sort of thing. So while many of them do have life, often similar to us, to claim that there's a 1 to 1 ratio of people is just crazy. It just doesn't work like that for anyone.
Except for Dave. He's in every universe, obviously.