Do not confuse the inner critic with the ability to think critically!
The inner critic is a voice within you that belongs to a parent, to you, or to a generalised member of some community (such as a professional one).
The critic's job is to devalue, to frighten, to hurt, to bring you down, to ignore the results of your efforts. To drag you into eternal misery and helplessness. Waving your hand at trying to do something: "Ugh, you'd better not start, it won't do any good anyway."
"Haha, and...