if you were riding on photon , it means that you are travelling at the speed of light. As you are travelling with constant speed , meaning you are in constant motion. From your prospective , entire universe is travelling at speed of light in opposite direction. As speed =Space/time (in broader sense), to make the speed of light to be constant , space must need to be shrink in the direction of motion and time need to be slowed down for you , but you are unaware of the effect, and has not way to find it out.

I really the way ,that you explained so, enthusiastic and passionate and insatiably curious.