I'm just winging it here.

There is a commandment that says thou shall not murder. I'd think killing yourself would pretty much violate that commandment and would be indicative of a rebellious heart not submitted to God.

But there is another side to the coin we should look at here. Some people suffer from extreme mental illness. Almost to the point they can't be held accountable for their actions. They've lost grasp with reality and just can't function. I'd view this as an extreme situation.

If someone has reached this extreme mental state where they've just lost grasp on reality and can't be held accountable, and they go and kill themselves, I personally would like to think God takes that in to consideration.

That's more of a reasoned wish on my part, than anything founded in scripture, so take that in to consideration.

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Galatians 5:15 If you keep on biting and devouring each other, watch out or you will be destroyed by each other.