I was sitting in chemistry class in 10th grade at age 16. I was having a very miserable year, the most depressive yet. I had no friends, no prospects, no confidence, and so I just suddenly realized as if in an "ah-ha" moment, why shouldn't I just kill myself? It was kind of a relief in that it seemed like a solution, although it surely saddened me that my life had come to this. The past few years, age 13, 14, 15 I had been becoming more socially withdrawn, less talkative, resentful, angry, hateful and detached.
A few months afterwards, at 16 and a half I sought therapy and finally told my mom of how much despair I had been in. I worked on recovering for a while and decided to give adolescent life a chance, until half way through 11th grade, when I decided that I wanted to commit suicide - came close to an attempt but never attempted.
So I was suicidal from ages 16-17 initially, then recovered come early adulthood, and around age 22-23 when I started having substance abuse problems and became homeless, suicide appealed to me once more. Then I recovered from homelessness and addiction at age 24, and after 2 years I have now decided once and for all that I ought to commit suicide before my addiction conquers me and I lose control of my life, which is surely a possibility for me because I have relapsed 4 times in the last 2 years though avoiding homelessness and thankfully staying employed. One more relapse could cause it to all fall apart though. I won't always be so lucky.