Psychology

Silencing your inner critic is not a thing you can finally do once and for all. If it were, there wouldn't be entire families of therapy approaches aimed at doing this.

Some things sometimes help some people. Ethan Kross has summarized modern findings in Chatter.

I like ideas from Internal Family Systems therapy (the voice in your head is trying to protect you, so show it gratitude while you remind yourself you're safe) and basic mindfulness (the thought is merely a pattern of the mind and you don't need to give attention to it, let alone believe it).

But, you know, that's just, like, my opinion, man.

Peace.