I really believe that all of us have a lot of darkness in our souls. Anger rage fear sadness. I don't think that's only reserved for people who have horrible upbringings. I think it really exists and is part of the human condition. I think in the course of your life you figure out ways to deal with that.
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When I was younger I was terrified to express anger because it would often kick-start a horrible reaction in the men in my life. So I bit my tongue. I was left to painstakingly deal with the aftermath of my avoidance later in life in therapy or through the lyrics of my songs.