Here is a suggestion no one has mentioned yet....seeing as there is an apparent vast pool of immense intellect on these boards ;-) , why not try meeting some of its members? I'm sure you are bound to find some select individuals that can arouse and stimulate your cerebrum...
Heck with the right company I can have a blast shooting the breeze all day and be absolutely nowhere special. Like others have mentioned (in so many words) life is not a spectator sport...feel free to jump right in!
I was once in the Keys, at a fishing camp, playing a guitar concert singing to a wildly attentive audiance of 8 pelicans on pilings.. ok one guy in the back had to leave early but he did not disturb the others... and .. when I finished, bowed, to a hushed audiance, and was walking back to my cabin, a guy standing there said "You have a really good time all by yourself, don't you?"
And I said, "Who would want to be with anyone who did not have a good time all by themselves?"