I've been really sad like that.... to the point that you can just go off somewhere and just sit by your lonely self.
Happiness isn't Christianity, and it isn't life either. Leading a Christian life means struggle adn hardship... peace, yes, but not an "easy life."
However! God gave us several, um, gifts that can bring a lot of "happiness" and definitely true joy to our lives.
When I have felt really upset in the past, I've found that good Christian fellowship is just awesome. Don't really haev to do anything relaly fun, but just talking and doing stuff together is really uplifting... once you force yourself to get up from sitting alone in your room, which I have done, heh.
That, prayer, and reading the Bible.
And yes you have helped people at CF!
* paulewog gives Snowy a huge plate of cookies
I don't know what your church situation is like, but perhaps it's not the best if you don't know many good Christian friends. That is half of church, fellowship with other believers... something God gave to us for our encouragement in our walk with Him, and in life in general! =)