Just because your facebook friends seem to be "moving on with their lives," doesn't mean they really are.
People get married, have kids, and buy houses for the same reason most people go to university straight out of college... they think it's what they're "supposed to do." They see most of their peers doing it and don't want to be left behind. But I don't consider this to be "moving on with life." I consider it somewhat of a fake life.
Take school and careers for example... I graduated high school at 18 and I didn't really know what I wanted to do, career-wise. So I got a job and worked for a while, then went back to college at 24. I didn't know what I wanted to do at 18, so I took some time to decide and that is perfectly reasonable.
Contrast that with most of the sheep in my high school who went straight into university right after the summer. They went eenie meenie miny mo, picked a job based on: "That sounds like something I might like"... and I can only imagine how much they hate their careers. And why wouldn't they? Not everyone knows what they want to do with the rest of their life at 18! At 18, I was a complete idiot who didn't know **** about ****!
So they end up with careers they don't like, but they can't change them without going back to school for another 4 years, so they deal with it.
People who have this attitude most likely have ****ty relationships as well. Same idea. They get married, realize they actually don't have that much in common, but stay together because it would be too much emotional work to get out of it. Plus by then, they probably have kids which makes it even harder.
These people with their "fast-paced lives" are probably more ****ed up than you are.
Take comfort in that.