There is a lot of freedom. And it can also be really scary. So try to just let it be all those things. And enjoy it as much as you can, without being too hard on yourself, and without expecting yourself to find another relationship immediately, because that's not usually how life works. In my experience, there's nothing you can do.
Some people are more social than others.
And that's it. Well, in the same way, if he's a shy guy he's not going to like it if you try to drag him out to parties. I think you either have to accept him the way he is, and if you can't, then you need to look seriously as to whether or not this is the right relationship for you to be in.