Why is my time different from yours?
Because time is relative to the observer, and there is a real, measurable effect called time dilation to explain this.
Did you know that you and I could have equally accurate clocks that tick at a different rate due to the effects of time dilation?
Spacetime is cool.
"In the theory of relativity, time dilation is an actual difference of elapsed time between two events as measured by observers either moving relative to each other or differently situated from gravitational masses.
An accurate clock at rest with respect to one observer may be measured to tick at a different rate when compared to a second observer’s own equally accurate clocks. This effect arises neither from technical aspects of the clocks nor from the fact that signals need time to propagate, but from the nature of spacetime itself.”