Friends
A lot has changed since high school.  Back then it was easy to meet people with similar interests, personalities and backgrounds.  Basically, if you lived in the same area, went to the same school, and enjoyed hanging out, going to the beach and fantasizing about the opposite sex then you could be friends.  The further away from high school you get though, the more your childhood friends go their separate ways.

Now that I'm 30, I've been through times with no friends at all, great memories with close roommates, hanging out with church goers who were my age, staying up all night with college study buddies, after hours drinking with co-workers, and spending time getting to know the neighbors.

With all of the different people I've met and talk to regularly, it's still difficult to establish a deep trusting relationship with any one.  The biggest reason is probably due to the lack of time that I, or anyone else, can dedicate to spending quality time together.  I might hang out with one person occasionally, but to get to the point where you're truly comforable being yourself and spilling your emotional guts takes a lot of time.

Having roommates is a good way to get to know someone on a deeper level, but usually even they end up going their separate ways after moving out, or perhaps they were already part of a tight network of friends that you didn't get to be part of.  In my opinion, even with being extroverted and having a variety of interests, it's just hard to find people that you can readily call your good, close friends.

While there are many people I'd like to know better and hope to grow closer to, at this point in time there are just two (aside from my wife) whom I can call my best friends.  Frank Liljeros and Giovanni Ucciferri.  Unfortunately, both have families (both have a wife and one son) and live about 1/2 hour away from me, in opposite directions from each other.