1: hide your personality, social work is generally hidden, otherwise you won't say that you are working with a mask, and communication is generally an exchange of interests.
2. Think of others, how can you think of others when you have hidden your character? Unless you have no character, you always do whatever you want.
3: People like it. Who do you want to like? In this society, not all people will like a person. Remember this sentence, only your true character can associate with the person you really like, otherwise you will wear a mask.