According to some branches of sociology and linguistics, the way we use language and how we portray ourserves is constantly changing, depending on the social situation. Meaning, there is no such thing as your true self; you are always putting on a mask, no matter what the situation. You are not wearing the same mask with friends than what you have on when you're with your parents; your children see a different you than the people at work.
It's quite baffling if you start thinking about it too much.