I've been thinking about similar things and rereading Pete Walker's steps for tackling the Inner Critic has been very helpful. I'll quote the three that stand out the most to me.
Quote
PERFECTIONISM ATTACKS
Perfectionism My perfectionism arose as an attempt to gain safety and support in my dangerous family. Perfection is a self-persecutory myth. I do not have to be perfect to be safe or loved in the present. I am letting go of relationships that require perfection. I have a right to make mistakes. Mistakes do not make me a mistake. Every mistake or mishap is an opportunity to practice loving myself in the places I have never been loved.
Micromanagement/Worrying/Obsessing/
Looping/ Over-Futurizing I will not repetitively examine details over and over. I will not jump to negative conclusions. I will not endlessly second-guess myself. I cannot change the past. I forgive all my past mistakes. I cannot make the future perfectly safe. I will stop hunting for what could go wrong. I will not try to control the uncontrollable. I will not micromanage myself or others. I work in a way that is "good enough", and I accept the existential fact that my efforts sometimes bring desired results and sometimes they do not. "God grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference" - The Serenity Prayer
ENDANGERMENT ATTACKS
Drasticizing/Catastrophizing/Hypochondrisizing I feel afraid but I am not in danger. I am not "in trouble" with my parents. I will not blow things out of proportion. I refuse to scare myself with thoughts and pictures of my life deteriorating. No more home-made horror movies and disaster flicks.
Negative focus I renounce over-noticing & dwelling on what might be wrong with me or life around me. I will not minimize or discount my attributes. Right now, I notice, visualize and enumerate my accomplishments, talents and qualities, as well as the many gifts Life offers me, e.g., friends, nature, music, film, food, beauty, color, pets, etc.