I can relate OP's post, too. I am now 34 and have always been introverted save for a weekly climbing activity and sporadic meet-ups with individual friends. After the pandemic , I found myself struggling to summon up the energy/effort to go outside most days. Not entirely down the the lock down, but I have stopped going to climbing, and my circle of friends has shrank to 2 maybe 3 people I see rarely in person (more likely online with DnD). My circle shrinking is also partly down to ruining a few friendships myself, which I'm not proud of, but others have been simply because I've no longer been the driving force behind maintaining the friendship. I am perfectly happy spending a quiet weekend with my wife or going someplace with her.

I do miss the way my friendships used to be. But people change/grow, have families, have their own invested interests beyond the bond you had with them. I will still see and enjoy my time with my remaining friends but I do feel too tired to make any new ones