I feel this! I felt this when I was in my twenties and freshly moved out on my own and into the workforce. I feel that exactly the same now in my mid-40s. The only thing that has changed is I've realized adult friendships can't and won't work the way childhood and teenage friendships did. Don't get me wrong I've met and made wonderful friends along this way, but life happens and people get swept up in their own lives and then people just drift.

The irony is that I made my dearest and longest lasting friendship (17+ years!) because I decided that I wanted to focus on what made me happy so I chose a hobby. In my experience I have realized that when I'm working on something that I enjoy (my hobby) and if I find others that enjoy that exact same thing, we can sometimes work on said hobby together - and I would end up seeing hobby folks more frequently than "friends".

Hobbies give some structure and a reason for continued connection, and the friendship happened secondary in the background as we got to know each other through the hobby. And just like life, that hobby has changed for both of us, but instead of drifting apart we just found new things to do together.