Most writers are afraid of themselves. They seek validation from others: fellow writers, Facebook friends, Tweeters, editors, agents, and publishers. I admit, I open my email each day hoping to glean positive comments from readers . . . to make me feel good about myself and the lot I've chosen in life.
That's why rejection drops us to our knees . . . we rely on others to tell us we're right/good/funny/fill-in-the-blank.
The blog Write to Done has some remarkable posts. Recently they did one on criticism. Five Steps Towards Making Peace with Criticism. In general, we should accept the fact we aren't perfect, or even good, especially when we are starting. Ever notice kids? They're eager to learn? They make mistakes, anxious for you to tell them what they did wrong so they can get it right! They are open to failure because they know it's on the path to success.
Be strong. Pick and choose what you learn. That's a huge mistake of writers in critique groups. They accept everything as gospel or get too defensive that they were critiqued to start with. Welcome feedback, then be selective. It's the criticism that's important.
Feedback from anybody, learned or ignorant, seasoned or novice, editor or reader, is to be filtered and not taken personally. You can be a green-as-a-gourd writer who can't match nouns and verbs and yet still be a confident individual. The power of ourselves should not be affected by the level of our writing.
If your writing isn't working, and others tell you it stinks, remember . . . it isn't about who you are. It's about what you're delivering . . . and that is totally in your hands to fix.