We live our lives using habits. We have a habit for everything we do. A habit a response to a cue or trigger which leads to a particular action which gives satisfaction and pleasure. It is a learned behaviour. A habit that is out of control and affecting your whole life is an addiction. Habits can be changed and different (better) habits but it takes some work. It is generally agreed that it takes at least 21 days of effort to change a habit.
Overeating, lack of self-confidence, abusing social media, shouting or arguing are all habits.