How do you grow up?

So, I used to like to spend my time playing video games and watching TV, and that is all I've done this past decade, but it's become rather boring and sort of embarrassing. I want to move onto something else but the problem is though that it's pretty much all I know.... What do I spend all my time on now? I'm almost thirty so does that mean I have to get into a relationship with a girl and have kids and all that weird stuff? I don't want to do that yet. It seems like such a chore!

Where do I go from here? How do I become mature? What's the process - in point form preferably.

Thanks,
Anon.

I've decided to say fuck it and just keep doing what I'm doing. I'm taking a nihilist view on life now. We are all going to die with nothing, our lives mean nothing, really, so what society thinks is of no matter to me. I'm going to enjoy myself as much as possible. And I don't care if that sounds childish!