Mine started with the death of a teacher in high school. She was a sweet, wonderful woman, and when she passed away it broke my heart. A year later I came down with a horrible infection in my mouth cause of an impacted wisdom tooth. My parents didn't take me to the doctor until the glands in my neck started to swell and I started running a horrible fever. I couldn't eat, or anything. The dentist said if I hadn't walked in on that day, I might have needed to get to a hospital. I wound up taking tons of medication and scheduling six oral surgeries for my mouth to clean it up. Unfortunately, my parents didn't want to pay for the surgeries, and so I never went back (had to go to Mexico, across the border from where I live).
....yeah, that about sums it up. My grandpa died a few years after that from cancer, but I think it was my high school teacher and my own illness that really brought it out.