We experience time as flowing from the past to the future.
According to Einstein, time depends on the observer. What is "now" to us is not "now" to others. If correct, this means in an infinite universe all time exists "now". This is also the case with quantum mechanics where things may be described as wave functions that exist in all time and space.
Concepts of time and infinity are extremely hard to grasp. It means that to some observers the past has not yet happened and the future already exists. Really, we know so very little.
Already some really counter-intuitive ideas have been proven. For example, tunnel diodes only work as a result of quantum mechanical tunnelling.
What appears "real" to us may not be.
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