What do you live for?

[Ravenshire]

Being human transcends our natural behaviour. Yes of course, it is in our genes to not kill ourselves, but we can easely put that aside. There is a reason why suicide is a main cause of death around the world. So that's why the question: why don't you kill yourself?

(emphasis is mine)

I wouldn't say suicide is a main cause of death. It's listed 24th (as of 2002) which seems pretty high, until you see it only accounts for 14 of every 100,000 deaths. That's 0.014%
Source

To answer the OP, there are many things that give meaning to my life. First, family. After that, an evening thunderstorm where the rain get's backlit by the setting (already just past the horizon) sun. It's what John Denver spoke of in the song "Rocky Mountain High" when he said "I've seen it rainin' fir in the sky." Sitting at the edge of a high mountain lake right at the edge of ice out, listening to the fracturing ice creak and moan. Turning a corner on a wooded path to find a millpond smooth mountain lake reflecting the high peaks behind. The rumble of a beloved purring pet as it drifts off to sleep in your lap.

I could go on for a long, long time.

The christers claim that without gawd, this life is cheapened. I say that being the only life we have makes it much more precious.