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Inner Critic: This is bullshit. I do not love and accept myself exactly as I am.
You: What's missing?
Inner Critic: I'm out of shape, I live alone, and I make two cents out of every dollar I make for my boss.
You: Yeah, those all suck. Damn. What can we do about these things?
Inner Critic: Man I dunno, I just know this sucks.
Inner Manic Pixie Dream Girl: Hey, remember that broadsword club that meets in the park every Saturday? We could start doing that again, it's free, and it's an hour or so waving a heavy thing around with a bunch of other people, some of whom you know damn well have better jobs than us and could end up being a valuable connection if we end up as friends, some of whom might also turn out to be potential housemates, friends, or lovers. No promises of anything beyond "getting in better shape" but that's certainly more opportunities for something to happen.
Critic might not be logical at all.
Referenced is an excellent book[0] from a clinical psychologist that has many detailed strategies to dig out the reasons behind critical thoughts and properly reframe them.
0 - Self-Esteem by Matthew McKay; https://www.amazon.com/Self-Esteem-Cognitive-Techniques-Asse...
Perfectionism, avoidance and other problems often have very traceable roots in the past, and there are therapy tools like EMDR[1] that help to fix or mitigate the root causes.
In my experience, it is not really possible to fix serious emotional trauma with affirmations, and deeper emotional work is required to start seeing your inner critic (and other trauma symptoms) shrink.
The best way to start working on such problems as inner critic is to find a licensed mental health specialist.
0 - http://www.pete-walker.com/shrinkingInnerCritic.htm and similar research on CPTSD
1 - https://cptsdfoundation.org/2020/02/17/emdr-and-trauma-what-...
His book is a good starting point, along with two other classics[0][1], but it is also rather old (10 years this year!), with more strategies and research done on top of it by other psychologists since then.
[0] Body Keeps the Score by Bessel van der Kolk https://www.amazon.com/Body-Keeps-Score-Healing-Trauma/dp/01...
[1] Running on Empty by Jonice Webb & Christine Musello https://www.amazon.com/Running-Empty-Overcome-Childhood-Emot...