Our experience of linear time is a perceptual illusion created by consciousness. In fact, so is "space.
Closely related to the idea of time is the notion of "linear causality" — the idea that A, causes B, which then causes C. The apparent causal relationship between events is also just a purely perceptual illusion — albeit a very convincing one. The reality that we are experiencing is by no means an "objective reality" as most people presume. It is more like what we would conceive of as a virtual reality, but one with some very interesting rules. Let's briefly review the basics about what you and the universe really are and then we'll dive into how and why time and space are illusions.