It's hard as hell to be vulnerable
The path to vulnerability doesn't make sense if you believe being vulnerable means you're weak or you'll feel exposed to a cruel world. Yes, there are people you can't be vulnerable around. But there are also those you can and maybe should be if you want to develop closer bonds. Vulnerability can be the scariest but most freeing thing to do. Don't waste your time trying to be someone you're not because you end up with a lingering drain that never goes away.