Eighteen confidence affirmations for men — plain lines about self-respect, capability and being comfortable taking up your own space.

Male confidence is badly served by the material available. Most of it is either performance advice — posture, voice, handshake — or the kind of language that assumes the reader wants to dominate a room. Neither has much to do with the thing itself, which is a fairly quiet sense that you are alright and do not need the room to confirm it.
These eighteen lines are aimed at the quiet version. Several are almost boringly plain: I am a responsible man, I deserve respect. Plain tends to be what survives being said on an ordinary morning.
The best line here is arguably the longest: I am a man. Above all else, I am also a person. Therefore, my beliefs matter, and my voice matters. It does the useful thing of grounding confidence in personhood rather than in status, which means nothing external can revoke it.
I am capable of admitting to and correcting my mistakes belongs to the same idea and is the one most people skip. Confidence that cannot survive being wrong is not confidence; it is a good performance with a short run.
Two of the eighteen are about attractiveness, and they are there because men are rarely given permission to say them without irony. If that is not your concern, skip both — the list does not depend on them. If it is, saying it flatly and without a joke attached is most of the exercise.

1. “I see myself as a strong and confident man.”

2. “I am an attractive and confident man.”

3. “I am a remarkable man.”

4. “I am a responsible man.”

5. “I am proud to be a man.”

6. “I am proud to be a man and I am proud to be me.”

7. “I am the man I have always wanted to be.”

8. “I am a strong man.”

9. “I see myself as a strong and powerful man.”

10. “I am a man. Above all else, I am also a person. Therefore, my beliefs matter, and my voice matters.”

11. “I am inspired by amazing men in my life.”

12. “I feel strong and confident in any situation.”

13. “I know what greatness I am capable of and I hold myself to that.”

14. “I believe in my ability to handle tough situations.”

15. “I am capable of admitting to and correcting my mistakes.”

16. “I choose to be proud of myself.”

17. “I deserve respect.”

18. “I am an attractive man and feel great in my skin.”
By repetition changing what feels normal to say about yourself. The first few times, "I am a remarkable man" sounds absurd; after a fortnight it sounds ordinary, and ordinary is the goal. The point is not to convince yourself of something false but to stop flinching at something reasonable.
Move down the list until you find one you can say without arguing. "I choose to be proud of myself" is a lower rung than "I am a remarkable man" — it describes a decision rather than a verdict — and it does more good than a line you reject. Belief follows use more often than it precedes it.
Two to three weeks of daily use is the usual point at which people notice they are speaking to themselves differently by default. It is unglamorous and it is roughly the same timescale as any other habit.
Yes, and the list is built around it. Arrogance needs an audience and cannot absorb being wrong. That is why "I am capable of admitting to and correcting my mistakes" sits alongside the stronger lines — it is the load-bearing one.
Take "I deserve respect" and "I feel strong and confident in any situation" and use only those for two weeks. Then add one. A short list used daily beats a long list read once, every time.