Questions?

What if you could go back and alter something in your life? Would you do it? Would you have any notion of what impacts it would have on everything else around you? In an attempt to change yourself, would you change your whole world? Would that world even remotely resemble the one you know? Or would it seem that anything about yourself would have so little an impact on the world around, that the changes would be so subtle as to barely notice? Can any of us really know what kind of an impact our presence has on the world?