The moment nobody sees
From the outside it looks as if you had nothing to say. Inside it was the opposite: the contribution was ready in your head, you just did not say it out loud. The whole difference lies between those two things, and it is invisible.
Usually it is not one big moment but a chain of small ones. You wait until the other person finishes. Then the next contribution comes. Then the topic has moved on. And in the end you think it was not that important anyway.
Why a communication course is usually not enough
The standard advice is: speak up earlier, speak louder, take up more space. That is not wrong, it just starts in the wrong place. It treats the silence as a technique problem.
If you check in your head whether your contribution is good enough before you say it, technique is not the bottleneck. The check is. And it runs faster than you could speak.
What that check is actually checking
The question in the background is rarely whether the content is correct. It is closer to whether this is enough for you to be allowed to sit here. Professionally you have long known that your contribution holds. The check is asking something else.
This is closely connected to what your self-worth is tied to. When it hangs on performance and on confirmation from outside, every contribution becomes a small examination. And examinations get avoided where possible.
Research on self-worth suggests that it is not the level that matters but its conditions. Not how much am I worth, but what does it currently depend on.
What actually helps
The smallest effective step is not to speak more often. It is to finish speaking once. When someone interrupts you, one sentence is enough: I was not finished.
The sentence works because it is factual. It attacks nobody, it only restores what was true anyway. That is exactly why it is hard to push back against.
And it has a second effect that matters more than the first: you make the experience that nothing bad happens. That experience works better than any insight, because it proves something to your head instead of telling it.
If you try it
Pick one meeting, not all of them. And plan to say one sentence, not three. Afterwards write down what actually happened, not what you had feared. The distance between the two is usually the real finding.