Everything - including you - exists as a wave form in both past and future contexts, whereby the future can affect the past just as easily as the past affects the future - this is called retrocausality and we are subject to it all the time, which is why we seem to be preparing in advance for events we didn't know were going to happen. And why we are given to alter our perspective on past events in the light of changing circumstances.
For more on retrocausality, including helpful links, click here.