i used to have this 'tape' in my head that played over and over, undermining me, and making my life hellish: "No Damn Good".
i learned to focus on all the good things i had done, the general inclusion of Goodness which we all deserve, and otherwise to refute and remove the energy from that saying. eventually, little by little that voice faded away. now i am working on the one that says: "Do It Yourself".