A few times when I was a teenager. I once took 13 tylenol thinking it would do the job. It just got me taken to the ER with a lot of pain. Second time I tried to cut the vein in my arm but the knife was too dull. Third time I tried with a plastic bag over my head but the CO2 was too much for me to handle and see it through.
Over ten years later, I arrived at a point where my life had been thoroughly destroyed by a vicious bully who first broke my heart by turning my crush (who had feelings for me too - to this day it remains the only time in my life I have ever had my romantic feelings requited) completely against me, and then destroying my reputation with gossip and slander which made all my friends block and disown me. It all culminated with my crush becoming facebook official with one of the guys who was now my ex-friend. When I saw that, I started making my plans to wander far off into Angeles National Forest and then shoot myself in the head with a 9mm.
I went to a sporting goods store, picked one out, and put down a deposit. They jerked me around with estimated arrival dates for over a month, until I finally gave up and got my deposit back. If I had known about Sodium Nitrite back then, I definitely would have done it.