Yes, absolutely. You might take a friend's criticism in a different light from that of a stranger's. Would you remain friends with somebody who hated your writing for whatever reason, and thought it was silly, or offensive or dull and boring? If you can honestly say yes to that, then fair enough, let them read your work. Make it very VERY clear to them that you won't take offense or get hurt, no matter what they say—and then don't. The opposite might also happen. Because they know you, and maybe know the extreme effort you've put into the writing and how much it means to you, they might be reluctant to be honest in their criticism. There's nothing wrong with friends reading your work, if you really DO want honest and constructive feedback. However, it's a good idea to get other readers on board as well. I think the biggest mistake is to be in too much of a rush, and to limit feedback to only a couple of people. Get as wide a range of criticism as you can. The diversity of opinion is likely to surprise you. Not everybody is going to love your work. No author has that distinction.