I too hear those self doubt voices, and those why bother voices. I find they are louder when I am tired, or under alot of stress. Taking some much needed ME ME ME time helps calm them. Even a simple bubble bath, or a chair on the deck to sit in the sun for 15 mins can help alot. I learned to practice yoga breathing, and meditate. Allow them in, and allow them out. Just let them float through without having to pick them apart.