Yes, you've learned what almost everyone learns once they get into their 20's. Its a LOT harder to make friends as an adult than as a kid or teenager or college student. I mean when you're younger, you make friends with someone because they sat next to you in class, lived across the street and were the same age as you, or were in the same major in college. Once you hit adulthood, life takes precidence. People get preoccupied with careers and paying bills and doing all of the responsible things that adulthood requires. No longer do potential friends come out of the woodwork. You have to make an effort.....but sadly, a lot of other people just don't want to make the effort, so its harder to find those who are willing to invest in friendships, even relationships.

And it doesn't really get any easier as you get older. I'm in my 30's now and I'm still frustrated with how hard it is to make friends. I joined a pen pal site which has made me a few good friends, but its very hit and miss. Most people fall by the wayside within a few months or less.