i was 28 when my daughter was born i was still scared then but its the only great thing in my life now, shes 6 and shes amazing and my entire motivation. Before she was born i was a stoner and i went from dead end job to another one without a care in the world where my next meal was coming from.
since she was born i took life serious i had someone else to look after so i manned up and got promoted a few times.
All too often I see cases of depression and anxiety as a result of this very same thing, social isolation usually the result of a relationship or children.

Its easy to "look" at someone elses life on facebook and see all the highlights, you dont however see all the dead time inbetween and all the trouble/issues a person might be going through as that isn't generally publicised on facebook!.
Doesnt matter what you do buddy. We all die and it doesn't matter how many times you have flown around the world. You will cease to exist so none of it matters.
Life of a party me.
Kids must change a lot. I don't really want kids myself as it's just something not for me (hard to find girls who really think same) but if you want a family etc you shouldn't worry about others
But I am 28 and also just think I'm in too much of a routine tbh.
I don't want to go out and get hammered but I do want to do/see more with holidays and weekends etc
I felt the exact same a couple of years ago in my late 20's. Didn't like kids, certainly didn't like babies and wanted nothing to do with them. Then my wife became pregnant, she was delighted, I pretended to be. Your opinion changes real fast though when you looking at your own child. Everyone said that to me too but I didn't believe them. How wrong I was!