Vulnerability is frightening, and most people find it to be a weakness. I disagree. Being vulnerable —those moments when you lay everything you’ve got on the table— is when you can truly grow and become a better version of yourself.
There's something powerful about being vulnerable and exposed in our daily lives. The common response is to harden our exterior and prevent anything from "getting in" or affecting us, but without moments of true vulnerability we might otherwise lose out on meaningful connections. Trust is just one quality among many that appears to be rooted in our ability to be vulnerable with one another.
As an experiment try and imagine your world without any trusting relationships. If that world felt cold and uncomfortable, a lack of vulnerability might be the key. If your current world feels the same, you might want to consider opening up to someone, hopefully, they will reciprocate and you can begin to appreciate the sunshine.