I'm a grown adult, C-level professional with ZERO real-world friends. And I've tried... but the connections haven't stuck. It's quite bothersome, and makes you question everything about yourself and why this outcome could possibly be true after a lifetime of having tried to maintain and improve connections with others.
I've adopted a more tolerant and accepting self-view with respect to this, and the pain level of being completely socially isolated is in the 20-30% range, but the pain of on-going disinterest on the part of others was quite high.. like 80-90%. So it's a bit of progress. But my point is: for those who haven't found their way to an operable level of acceptance, a "WTF!" response isn't kind or helpful or insightful.
There are many of us "ForeverAlone"-ers out there, and trust me... we're 10x more confused than you might profess to be.