Black and white, good or bad, are typically the way you look at things. You know what it feels like to be bad, and how those feelings make you behave. And then if you are good there is always the risk that it won't last. So either way you set yourself up. Adult children have difficulty having fun.
Adult children take themselves very seriously.
These two characteristics are closely linked. You didn't hear your parents laughing and joking and fooling around. Life was a very serious, angry business. The tone in your house put a damper on your fun. Eventually, you just went along with everybody else.