I wanted to throw my two cents in here...

I'm 24 myself and I talk to one or both of my parents just about everyday. I didn't really have great relationship with them growing up, but they frequently seem to become among your best friends as people get older (in my observations).

I'm a pretty shy person myself, so I don't have many friends outside of my family, but the ones I do are fantastic. However, I wanted to ask with the friends you have, do you share a lot of the same interests? For example, my closest friends usually just want to make dinner and have a movie night on the couch versus going out to a party where I would be uncomfortable, and would probably turn the invitation down in the first place...

So the activities that the friendships revolve around might be a part of it.

And as to never feeling ready, again, in my experience, it seems like this is pretty normal and so far I've crossed my fingers, held on and jumped into the job world without too many problems. I still sit back and wonder how I decided on a college, major and somehow made it through the program with no idea of what exactly I was supposed to be doing! Haha. Just keep pushing through, it's amazing what just enjoying the ride will bring...

Good luck!