My first affirmation was way different than the kinds listed upstream. It requires a little explanation.
When I finshed my first novel-length story, I sent it out for evaluation thinking I'd get back the a significant affirmation of my effort and my "talent." What I got back was the equivalent of having a "new one ripped." I had the usual newbie response. How dare that a$$hole not recognize my brilliance, my wonderful writing. He must have an agenda of pushing down the competition. Then, after a little time of thinking about the crits, I came up with the grandaddy of all sidesteps of professional maturity, "It wasn't so much what he said, it was how he said it."
At the time I received the crit, I was a about half-way through my next story. I shoved it aside thinking that if this was the kind of a$$hole I'd have to deal with in this writing business, I wanted nothing to do with it. That lasted a couple of weeks. Then, I started to dissect the crit comments and eventually I realized that if one were to list the 50 most common mistakes new writers make, I not only made them all, I made them in colossal purple splendor.
I picked up the WIP and began the process of re-writing what I had, paying attention to all of the issues noted for the first story. I finished that story and it became Phoenix. Next, I returned to the original (ripped) story and dug into a re-write. That story became Something Bad (that's the title, not a description, although y'all are free to draw your own conclusion).
My affirmation came from two things. My forced learning of important aspects of the writing craft (which still is in progress and never will stop), and the realization that the best way to enhance that learning is to put my work out for evaluation so I can continue to learn how to strengthen and improve my writing. I read many of the books on writing before submitting that first miserable story, but the lessons and examples didn't sink in until I saw them redlined in my own writing. So to me, affirmation comes from peer review, but not in the way you might think. It doesn't come from positive comments, but in the gracious comments of betas who point out issues and problems with my writing, and the resultant feeling of, "I can fix this stuff."