The loneliness thing is real
I have friends but none of them are dads yet and I feel like I can't relate to them anymore. They're still doing the whole 'let's party on weekends' thing and I'm exhausted just thinking about it. My wife has her mom groups but I don't really have equivalent. I love my kids but sometimes I feel like I'm doing this in a vacuum. Do you guys have dad friends? How did you make them? The playground mom groups feel awkward when I show up solo.
The parties thing is rough because you WANT to care about that stuff still but your brain is just too tired to process it anymore. That's not a loss though—that's growth.