One of the strange paradoxes of life is that to be trustworthy, you first have to learn to trust others. What I've experienced, and it's also written extensively about and proven in studies, is that most people in the world are trustworthy, and you can be vulnerable around them.

Walking around thinking people are untrustworthy narcissists puts you in a really dark place. I wouldn't wish that on anybody.

Second, I'm assuming you're thinking of vulnerability as sharing your emotions and insecurities with people. While That's true, it's not entirely accurate. Being vulnerable isn't just about bringing out your darkest side for people to see, it's also about sticking your neck out in a situation where you have no control over the outcome.

Going over to a busy table to talk to random strangers, that's vulnerable. Extending your hand out to greet somebody, that's vulnerable. Spreading out, taking up space, and being comfortable in your skin, that's vulnerable. Reaching out for that first kiss, that's vulnerable. Cracking a joke that others might not find funny, that's vulnerable.

Whenever you're doing something that does not betray your principles, you're being vulnerable.