Collecting rejection letters

I've finished my first story and am now collecting rejection letters. My story has been turned down by six magazines so far. One of the magazines gave me a personal rejection letter. I was so delighted that I had evidence someone actually read the thing! The rejection letter had suggestions for improving the story, and that was very helpful. I will send my next stories to that magazine first. I'm also working on two new stories, one of which I'm finding hard to finish, the other one is flowing nicely.