Read these quotes about rejection if you ever have doubts, not just about writing, but about ANYTHING you are doing which can, or has to, be judged using someone’s personal opinion:
“This is not a book that should be tossed lightly aside. It should be hurled with great force.” Dorothy Parker
“Thank you for sending me a copy of your book – I’ll waste no time reading it.” – Moses Hadas
“Any reviewer who expresses rage and loathing for a novel is preposterous. He or she is like a person who has put on full armor and attacked a hot fudge sundae.” Kurt Vonnegut
I’ve been reading reviews of my stories for twenty-five years, and can’t remember a single useful point in any of them, or the slightest good advice. The only reviewer who ever made an impression on me was Skabichevsky, who prophesied that I would die drunk in the bottom of a ditch.” Anton Chekhov
I used to save all my rejection slips because I told myself, one day I’m going to autograph these and auction them. And then I lost the box.” James Lee Burke.
Nightwalks 