I suffered much of my life under an oppression that, I think, many Christians suffer under: the idea of being a burden to God.
The good news of the gospel is, of course, that we can be free from our sins, but this is not always perceived as good news. For one thing, "our sins" can sound too much like "fun stuff" and we see the gospel as being a proclamation that we can be freed of everything we enjoy about life. This in itself can get us on the road to despair, because we have a hard time reconciling the joy of the Lord with the idea that we must give up whatever we find enjoyable.
But an even greater burden lay in the Christian message that Jesus died to take away my sins. This translates to the view that every sin I commit has caused him pain at the cross. Since, despite my efforts, I will continue to sin until the end of my life, it follows that Christ would suffer less if I were to die today than if I were to continue living (and sinning) for another couple of decades. And that Christ would suffer even less if I had not been born at all.
Throughout my life I have heard many sermons in which the utmost was done to get me to feel sympathy with Christ's suffering. No doubt there is spiritual merit in meditating on the suffering of our Savior. But the side effect has been to make me despise my life, which, after all, was the cause for his suffering. It has made me wish I had not been born, which is another way of saying that it has led me to despair.
I was not only afraid of a regular occurrence of sins adding up; I was also worried that new sins would be born. In other words, it was not only a matter of having more years to live in which more situations would arise in which I would again fall prey to the temptation to lie. It was a fear that new situations would arise in which I would fall prey to temptations I had never known before. As a 7-year-old I had not really struggled with lust. I would have had fewer sins, and therefore inflicted fewer injuries on my Savior, if I had died before reaching an age in which I made my acquaintance with lust.
So who knows what else is coming towards me in the years to come? I imagine situations in which I am coincidentally holding a crowbar at the precise moment that someone makes my temper boil over. How easily one can take a swing in blinded rage and murder someone! Wouldn't it be better for me to die now, before I have done something so awful?
Or what if I start drinking, and over the years slowly develop a habit of drinking uncontrollably? What if, in a weak and depressed moment, I am offered a hard drug that soon imprisons me in addiction? What if someday I am seduced? What if I join a movement that seems to promote high ideals but in the end corrupts me into becoming a violent power-monger?
It could all happen if I keep living. I certainly don't trust myself to be immune to any of these temptations. Considering how far God has allowed me to wander, I don't even trust Him to keep me safe. Sure He will forgive me, but come on -- what does forgiveness from God mean to the widow and orphans of a man you have just killed? The only way to avoid further damage from sin is to stop sinning, and the only way to stop sinning is to stop living.