Vulnerability is hard and requires honesty with self. Whether you express what it is that makes you feel vulnerable or you just sit in those feelings all by yourself, you are being brave.
We ask people to share something that makes them feel vulnerable as a way to practice brave action. Of course, there are levels of the the kinds of things we might be willing to share at all. All of it, from the stuff that makes you feel a little vulnerable to the stuff that makes you feel alotta vulnerable, is hard to face.
Facing something hard is bravery.