In a lot of worlds, my life is just the same, except for a slightly different selection of friends. In a lot more, I died a few years ago, or twenty years ago. In many more, my life just went a radically different way at various cusp points - except in most of those I know some of the same people, because my tastes were formed early on and a lot of my friendships have to do with tastes.
I think, for example, that in almost all possible worlds with me still in them, I am some sort of fan and some sort of writer.
I also sometimes think that some of my dreams are walks in those worlds.