When I started my career as a journalist, I got some great advice. Keep a physical file of any notes you get from anyone that say you're doing a good job. It's easier to remember the bad feedback, for yourself. But, when you're not having a day that is full of whiskers on kittens and warm woolen mittens, you can bring out your file and cheer yourself up.
It's a technique I still use today, although more often than not, I'm printing out emails to put in my file!