Well, would you cherish beauty if there was no ugliness?
Would you cherish love if there were no hate?
Would you cherish happiness if there were no sadness?
And firmly, would you cherish life without death?
As a matter of fact, death is more sense-able than life itself. But, you are here, and that's all that matters for now.
Better make the best of it.
PS: Don't get deluded by theories. No man, no matter his arguments, will be 100% sure of everything out there. They're just humans, after all.
PSS: I felt that same pain for a month straight. That thought went through my mind like a loop. I couldn't eat, sleep, think or do anything right at all. I was crushed, 24/7.
But, before I say this line, I am NOT A CHRISTIAN!...
I prayed to God in my tears. I thought I didn't want to know. I didn't want to know why, where and if anything of it. I just wanted that nagging, evil despair away.
After I finished my pitiful prayer... It was gone for some reason. And it still is. I don't know for sure what to believe, but what ever got that thing away... It wasn't something I had control of for certain.
But, yeah, you'll learn to cope with it once you feel yourself at peace. I've got all my tranquility and answers I need.
PSS...S...: I do freerunning. Guess how many times I've done something dareful and slipped off handrails or other slippery objects?
When I fall a good distance, there's always a thought that rises through my head. It's "I don't want to die! I've just begun this!" and my will to live increases tenfold.
Stop sitting at your computer, living a harmless and deprecating life.
Like I said, how can you appreciate life without the chance of death?