It's scary to put yourself out there. People who know you might not believe it, and if you fail they'll be right. People who don't know you trust you, and if you fail you'll let them down. And then what if they'll never trust you again?
But what's the alternative? Wait until you're ready? In my experience that can quickly turn into never.
So accept it. You might fail. They'll probably be right not have believed in you. And you'll probably let them down.
And now that you've accepted it and know it's still worth it, know that it's the worst case scenario. Because most of them won't care as much as you do anyways and will be happy to follow your struggle to the successful end.