Only what one perceives exist, and that happens 'now'.
What you perceive is not happening 'now' in the present. You can say it is... you can believe it. That's called "faith" in something. Your perception is dependent on the laws of nature. In order to see something, light has to travel... this takes time. By the time you have perceived it, time has passed and no longer exists in the present. If you go look at your reflection in the mirror, that was you a nano-second ago, not in the present. You can't see the present yet, it takes time for the light to travel.
Is this not getting through?