I know, Ness. It's like stripping yourself apart and letting the whole world examine your innermost thoughts. It's hard to get comfortable but you have to leap that chasm to overcome that fear. You have to clench your teeth and send it out there even if it feels painful.
Maybe it's because someone is never really happy or content with what they do, always knowing they can do better, always pushing for that sense of perfection they don't feel they'll achieve.