If there's one thing I've learned from being a technical writer for the last 19 years, it's to have a thick skin when it comes to getting feedback. I am so used to having my drafts come back covered with red ink that I no longer labor under the illusion that my words are somehow sacred or divinely inspired. Instead, I get really excited when people give me feedback, because it means they took the time to read what I wrote and paid enough attention to give me comments. I think developing this attitude toward getting feedback is absolutely essential for a writer.
That being said, you must also be careful to take all feedback with a grain of salt, and part of what helps you with this is getting many different people to read your work. If you have only two people read your book, you can get wildly different opinions and not know which way to turn. But if ten people read your book, and seven of them tell you your dialogue is too stilted, chances are you should listen to that feedback.
A couple examples of this came up for me recently. Two of my favorite bloggers sent me fantastic and detailed feedback on Merger, the second book in the Soterians series, which I just released. They both liked it, but one of them felt that there wasn't enough romance and she missed the interactions between Kai and Ashlyn that had been more plentiful in book one, Rising Shadow. The other blogger, on the other hand, said that there was too much romance for his taste and that he wished there'd been more action. I value both of their opinions very highly, and knowing that they represent two different audiences for my book, I felt that this critique meant that I had actually gotten it just right. If I'd just paid attention to one or the other, I might have been tempted to take my next book too far in one direction, so getting this type of varied feedback was very useful.
The other example was the feedback I got from the Amazon Breakthrough Novel Award contest. Rising Shadow made it to the second round, where two judges read an excerpt from your book and give you feedback. Their opinions were again pretty different; the first one liked it a lot and said she was left feeling like she wanted to find out more, whereas the second one said it left her feeling like "so what?" The second judge acknowledged that she'd just read another entry very similar to mine and that it might have impacted her impression of my book. The vibe I got from the first judge was a lot of energy and enthusiasm, whereas the second one just sounded tired, making me wonder if my excerpt was the last of the 250 she'd had to review. This is incredibly important to remember: no matter who is giving you feedback, they are people, and as such, there's no such thing as a completely objective review. Their feedback will depend on what else they just read, how they're feeling that day, even (as one agent said about her process of sifting through submissions) what they had for lunch.
So the upshot is that when you receive feedback, it's important that you a) put yourself into as centered and receptive a mood as you can, b) listen deeply without being defensive and try to see where you can improve your writing based on the feedback, and c) take it all with a grain of salt, because no matter how well-regarded or brilliant your reviewer happens to be, there are many factors at play that affect their perception of your work.
In other words, keep in mind that neither your words nor those of your reviewer are sacred. Once you truly grasp this, you'll find receiving feedback is actually a wonderful experience--or, at the very least, slightly less painful.