Here's how messed up I used to be:
I actually believed that since the wages sin pays is death, and the only unforgivable sin was 'grieving' the holy spirit, then since I was so miserable I should just kill myself and wake up in paradise. Jehovah would understand. He knows what's in my heart. He knows how I'm suffering and how messed up I am in the head.
Now that I no longer am a believer, though, I don't even think at all about doing something to myself any longer. Why? Because, since I now believe this is all there is, I don't want it to end before I can experience all that life has to offer.
I used to think that not believing in God and having no hope after death would make you miserable and want to just end it all.
For me, it has been the exact opposite.