Looks like you are doing 1 better than most http://www.nbcnews.com/health/health-news/you-gotta-have-friends-most-have-just-2-true-pals-f1C6436540
I'm not really a fan of that measurement method for multiple reasons. What defines what an "important matter"? Just because a person isn't somebody you would discuss an "important matter" with doesn't mean they're not a friend.
Yeah, I guess it also has to do with your definition of friend. If you would only consider someone your friend if you would discuss something important with them, I would say you have pretty damn rigid criteria for friendship. However, this article did make me realize that the number of friends I have who I would feel comfortable talking about deeply personal stuff with is diminishing kinda quickly. And they're beginning to become more and more scattered around the world.