Yeah this is a lesson I learned during the NBA playoffs sometime in the mid 00's - I was supporting the Cavs, and the whole series was hanging on a 3 foul shots by Lebron James. I was watching in a bar, and was super agitated along with everyone in the bar, and everyone in the arena as we could see on TV. But I noticed that James him self was completely stone-faced and calm. And I realized in that moment, that all this agitation wasn't actually useful, and would not affect the outcome. And even if I were the one in position to affect the outcome, that kind of agitation would actually make things worse.

That said, I've had colleagues who could probably do with a bit more shame. Confidence and self-assuredness is great for self-promotion, but if you can continuously produce shitty output with a smile on your face I don't want to work with you.

Can you? A lot of psychological literature shows that we are far from being masters of ourselves.

Depresses people cannot reason themselves to any result at all. Addicted people cannot reason themselves out of addiction. You can fix many things with therapy, but that's far from just "reasoning" and takes a lot of time and work.

Emotions come from a much older part of your brain than the one for your reasoning skills, and thus have a far stronger pull on your actions. That's not to say we are completely at the mercy of our emotions. But controlling them is a matter of practice and reinforcement, not pure logic.