There are other definitions of confidence, but this is the one that best suits this post. Belief in oneself! It takes a great deal of confidence to become a writer. I know it took me a long time to find the confidence to even begin writing. I didn't know if I could do it. It seemed so far out of reach. I spent my college days writing critical essays, but fiction? I didn't have the confidence to try. Thank heavens my husband gave me the encouragement to get going, and my confidence has been growing ever since.
Believe that you have important stories to tell.
Believe that you have the ability to tell them.
Believe that others will want to share them.
It may seem like arrogance, believing that you have something to say that others will want to hear. Believing that they'll pay for the privilege of reading your words. You may have self-doubt plaguing you. But don't listen. You can do this. I know it.
Just believe it.