I think what have changed my the most would be when my father nearly died.
I was around 6 years when he was out hunting in the mountains, he had a good hunt with his belt filled with birds and wild rabbits. Then he saw another big bird and aimed for it, he killed it with one shot. But the bird felt down an deep "valley" and he climbed after it.. and he fell (I wanna add "ed" here for some reason) when he was like halv the way down. He shattered his foot and arm, broke all ribbons on one side, took a lung and got something serius on the cranium.
Its pure luck that another hunter found him after 10 minutes (He heard the shot) and called up the SeaKing fast, but it was critical. After 7-8 months on the hospitale he recovered, and finaly came home.
Why this changed me? We was farmers, we couldnt do anything else than keeping the farm running. And with my dad gone that meaned lots of hard work on me. I changed alot on that time. I fast learned responsabillety (< typo there I know), and to enjoy what I had to do.
I now cant sit around to nothing for an longer time (I go crazy) I have to do something usefull at all times. My mother had also just gave birth to my first brother just before this, so I also had to take care of him alot.
This is something that I know 100% that have changed my life in many ways.