Are you sure this is entirely the modern lifestyle's fault? When I look deeply into my past I realize I messed up high school and college a bit socially (for various reasons) and that's the time most people acquire their best friends. I have 1-2 good friends but I'm pretty sure it's on me its not more than that.
Perhaps you went through something similar?
The real annoying thing is making friends after mid 30s is very difficult. I am very choosy about who I want to meet because I'm a parent and my time is valuable and I put up with less bullshit than when I was young. Alas, all "older" folk are like me - so we barely try to create friendships.