But we're all weak. All of us. First off it doesn't take many minutes of studying biology, astronomy or physics to figure out that there's not a hell of a lot keeping us alive, and there's plenty out there that "wants" to kill us.
Secondly, the perception of weakness is built into our species. That's what it means to be a social species. We're instinctually guided toward believing that we're better off solving problems together than alone.
It takes an insane amount of self delusion to believe that you're a one man/woman army capable of tolerating any rejection. But nobody outside of an insane assylum believes that of themselves. Not really. But that's not the issue really.
The issue is whether or not we think that other people really are and really feel strong. That's a question of insecurity. We can know things without feeling it in our heart.
If you have a problem with it just take your lipstick and write this on your bathroom mirror so you'll see it every morning before work: "Everybody are always longing to be accepted and encouraged by those they respect, just like you are." It's only the type of encouragement we respond to that sets us apart.
All the "loud/brash/pushy extroverts" are all faking security. Just like you, just like me... just like everybody else. The only thing that separates us is how good we are at faking. There's no such thing as a person being in a state of harmony... Yes there is... a dead person.