Second: A little while ago, I posted an "ask anything." And now, without further ado: answers!
Edited to add: I have no flipping clue why the spacing is so off on this one. Sorry.
Yes. YES. Actually, the closest I've ever come to giving up was just before I sent ACROSS THE UNIVERSE out. As for being scared to share your stories: I think everyone is like that. At least, every writer I know is like that. In fact, when I sent Book 2 to my critique partners, I distinctly remember sending a plea to them apologizing for how bad it was...
So, the short answer is: I have no idea how to make the doubt go away. None at all. I have it all the time. Instead, for me, it's a matter of living with the doubt, and sending my work out despite it.
I dunno. (That seems to be the theme of this post, huh?) It took me a lot of trial and effort to get the first chapters of my Book 2 written--and they're still not perfect. But that's how I write: I just write and write and write and hope something good comes out.
If you're working on this, I think that JK Rowling did a very good job of this, particularly in books 2 and 3. CS Lewis did an excellent job of this in THE SILVER CHAIR in particular.
I have no idea! :D I would guess sometime around this time next year :)