On being insecure

My Pastor has mentioned several times over the last year how dangerous insecure people can be in our lives. The problem I have is that I am the insecure person in my life and the life of my family. Often times I wonder when my insecurities will destroy my marriage and am astounded that it has not already. When will my overarching fear of rejection become one too many times that my wife feels like I doubt her love for me and become a self fulfilling prophecy? Insecurity breeds so many different emotions; jealousy, self loathing, fear, anger, worthlessness, doubt. It is a horrible storm that threatens everything it comes in contact with.