Honestly, I find the most happiness in attempting to help others get their own.
Mainly that's my wonderful girlfriend, whom I still can't fully believe that she would be willing to go out with me, but it has still been the most wonderful time.
Of course there's my friends and family, too, although I don't keep in touch with those just quite as often, mainly by issue of distance.
This joy in socializing I found IS a drastic difference of how I used to be in my youth, where I'd just hole myself up in my room and stick to myself all day, happy to be alone, but that just goes to show how many different forms happiness can take, isn't it?
It's a really thought provoking post that you made, making me question the roots of my own happiness like that. Thank you for spending the time on making it!