I attempted it when I was 13. it was a combination of being fat, gay, having no friends. Being gay was probably the biggest factor, but being gay AND obese can really mess you up....
but as fate would have it, it was not a very effective method.
first I tried cutting my wrists with a knife , but there were no knives around that were sharp enough.
then I reached for random pills, but it was the vitamin Niacin, and while my attempted overdose did cause extreme and scary pain, burning sensation, sensation like being pricked with knives all over and made me feel like I was going to die (even turning my skin weird colors like blue and green in places), I survived, did not even pass out...I just hid in the bathroom suffering until I felt better hours later and then was fully recovered by the next day... never told anyone, just went on with my life.
It was during the painful and scary experience that I realized I didn't want to die. so, even though I could now more effectively do it, I don't want to (even though I've thought about it a few times since then). In fact I ended up wanting to live a long life.