Physics has known this for over a century, but it has not reached you yet: time does not flow. There is no river of time carrying you from past to future. Einstein showed in 1905 that time is relative; it runs at different speeds depending on how fast you are moving and how strong gravity is. An astronaut on the International Space Station ages a little slower than you do on the ground. A clock near a black hole nearly stops. These are not just predictions on paper; they are measured, confirmed, working facts that GPS satellites have to correct for to function. Time is not a backdrop that events play out against. Time is a dimension, as real and as flexible as space. The past still exists. The future already exists. What you feel as the flow of time is a feature of consciousness, not of physics.
The block universe model in physics describes all of spacetime as a single, unchanging four-dimensional structure. Your birth and your death exist at the same time inside that structure, like two spots on a map. You are not moving through time. You are experiencing different slices of an already-finished structure, and the feeling of motion is created by consciousness, by memory, by the brain building a story. The mystics said the same thing. The eternal now. The timeless present. The Buddhists call it the dharma of impermanence, but impermanence is only how it looks from inside time. From outside time, everything is permanent, because everything already is.
If time is not what you think, then urgency is a construction. Regret is a story about a part of the block universe you can no longer reach with your physical senses. Anxiety is a story about a part you cannot reach yet. And the present moment (which every contemplative tradition insists is the only real thing) is the only slice of spacetime you are actually experiencing. The mystics were not being poetic when they said 'be here now.' They were giving you the most practical advice possible: the present moment is the only place you can act, choose, or change anything. The past and future are real, but they are not here. You are always here. And here is the only place anything happens.