Unfortunately we only get one set of formative years. It takes a lot of effort to "unlearn" what we have been taught through observation. Some people however go the opposite route. The child of an alcoholic for instance may choose to never drink or get involved with anyone who does.
Oftentimes we may not think something has affected us until we are put in a situation. For years (singer) Chris Brown did interviews talking about how he hated his father for beating on his mother. Later in life he went to jail for beating up his (singer) girlfriend Rhianna.