Your entire argument revolves around the following premise: if different beings have a different perception of something, that something does not exist. This doesn't seem like a very sound premise.

Human beings did not create time; they created measures of time and methods of measuring it. It was already there before humans measured it, as was space, energy, temperature, etc... The psychological perception of time has its own subjective phenomenology, but that does not entail the non-existence of physical time.