I feel most of the people play different roles everyday both intentionally (pretending to be someone) and naturally (playing natural roles of a student, friend etc).
Our life is a movie that can not be summarized in a 3 hour schedule.
Everybody in this world is an actor. We are playing different roles in different stages of our life. Many times we are acting naturally and some times we act falsely in such a way that our acting and our real character are completely opposite to each other.
William Shakesweare wrote that all the world is a stage and we are all actors. In that sense, I am an actor. However, acting is the role played in movies and drama. In real life, any one pretending some thing is said to be acting- which means he is deceiveing. I do everything sincerely and do not do anything that I do not mean. Hence I am not guilty of acting in real life.