Humans are naturally bad at predictions. Being bad at predictions, and figuring out how to make better ones, sounds kind of fun but not necessarily a basic life skill. Like, you can say, "I bet I'll spawn a baby infant by 2020 with 80% confidence!" or "Oculus Rift is going to be a market success - 65%", but you can't just want to make a really close friend and say, "I predict that I will make a really close friend this month with 95% probability" and magically have it happen.
Or can you?
I mean, the kinds of things you can try to do to make close friends are known. Get out of the apartment, do social events, reach out to people you like to hang out, be vulnerable, open up your schedule and routine to allow for repeated and unplanned interactions, practice your social graces, spend less time at work or with people you don't actually want to be close friends with, wear a really cool hat, and so on
But it feels like there's a lot of uncertainty on 1) whether you will actually do these things and 2) what the results of each effort will be. You vaguely wonder, "What if they don't like me?" "What if I don't like them?" "Does anyone really have time to make new close friends?" "What parties would I even go to?" and so on, until it feels like it probably wouldn't work. So you don't attempt any of these things, and so of course it doesn't work.