I talk all the time with authors who are afraid of what the future might hold for them as they branch out into this wonderful, crazy thing called writing. They're worried that no one will like their book, that they won't sell anything, that they'll get terrible reviews, that they'll look foolish on a large scale. Some are afraid of success and all the positives and negatives that can go along with that. There's a lot to fear when you're an author.
But did you ever get what you wanted without risk?
Did you ever accomplish something new by continuing to do the same things you've always done?
Have you ever been given a huge prize for staying home in bed?
I agree with you - writing is scary. Sending your stuff out there for all the world to see is scary. Hearing what others have to say about your book is scary. But it's a good kind of scary - the kind that tells you you're still alive and that your heart is still beating.
Don't let your fears hold you back. Your fears will keep you from finding out what it truly means to live. And it would be a shame to go for an entire lifetime without knowing what you were here to do.