“Quantum physics tells us that no matter how thorough our observation of the present, the (unobserved) past, like the future, is indefinite and exists only as a spectrum of possibilities. The universe according to quantum physics, has no single past, or history. We create history by our observation, rather than history creating us.”
We have to remember that what we observe is not nature itself, but nature exposed to our methods of questioning.
What kind of rear view mirror are you using? If the past is your memories and interpretations of observations made by others of where we’ve been and how we got here, then the tool through which you observe, measure, or relive these events can change history for you and therefore have profound affects on who you are now and who you will be. That is if you have any say in the matter. Which I just assume is the case since if I don’t then why the hell am I working so hard.