"Feelings of inadequacy are the black lung disease of writing." - Charles Baxter (Page 81)
"Writer's Block" may be the only thing that could trump the feeling that what you're writing is a stinky pile of dung. Nothing's worse than staring at the flashing black line on your computer screen and all you can think is, "I'm hungry".
I've been writing since I was about 7-years-old. At first it was only fictional short stories but when I was a freshman in high school I began to think more long-term about writing. I started writing a fictional novel. Honestly, the novel ended up being crap. The basic idea is still good but the way it was developing was awful in every way.
I don't know how many times somebody's asked me to read what I wrote and I'd say to them, "No its awful." Or they'd try to be sneaky by reading over my shoulder and I'd cover the paper/computer screen. Or I'd ask people a hundred times, "Did you read my post?", "Was it good?", "Did you like it?".