Something About theory

This time I wanted to share something that came to my head
coincidence I was thinking about einstein theory, much like this

 

we may be able to feel the Einstein theory in everyday life
for example, what if two people call it A and B, they both started at the same time. the A do activities such as walking, etc., while the B just sat there waiting
then they both felt the time would be different the A would feel 1 h only felt like 15 minutes, while the B still felt the time had passed for 1 hour, this could be a parable that speed can influence  time even according to a person feels only.
for proof, it must use a moving object with the speed of light

this just something that came to my mind only
so if incorrect or had no pleasure please understand,