For those of you who knew me (or at least read my LJ) back when I was still fighting the depression, I imagine this is quite a change for you from the morose guy I was back then ... a positive one, I hope. ;) Truth of the matter is that this is what my "natural" personality is like; the depression turned me into somebody else, somebody that I didn't much care for, and frankly I'm glad he's gone.
I had a realization a few months back while I was chatting with tygercowboy; I'd had a long day of comforting various unhappy people, and when TC popped up in the chat list, it was a profound relief to see somebody who I knew would be cheerful, upbeat, and positive to talk to. That made me realize that there were basically two types of people I interacted with: ones who brought me up, and ones who brought me down. I then decided two things: first, to try to seek out and reinforce the former, while trying to minimize the latter, and second, to make sure that for other people around me, I was one of the former myself. And both parts of the decision have been important factors in my own turnaround.
So my advice is: go be somebody's cheerleader today! ;) Just make sure it's somebody on whom all your positive energy won't be wasted ... there are black holes out there. :)