Honestly, it wasn't a matter of confidence so much as pride. When you publish, there's always that part inside of you that says "What if no one likes it?". When that happens, you have to evaluate your reasons for writing, and for publishing. I published because I had spent years on this manuscript. I didn't want to just leave it on a shelf to be forgotten. I was also able to look at it and remind myself that (at least for now) writing wasn't my career. My livelihood didn't depend on becoming a bestseller. And if people didn't like my work, I was going to have to suck it up and accept it - as hard as that might be. All I can say at the end is this - there is no downside to taking pride in your work, nor with sharing it.