I've discovered the biggest thing you want to remember about NaNo is not to compare yourself with others. Unless that's a good way for you to be motivated, you need to remember that what is an amazing count for you is going to be nothing for someone else.
I will get to a certain level, only to notice that someone has already reached 50,000 words. My first thought is that they must not have a life! I mean, how can you possibly write that much in such a short period of time when you have people to take care of, a job to go to, and a home to maintain? It just doesn't seem humanly possible. Of course, I write more and more each year, so perhaps it's just a case of getting the mind going and the fingers moving.