Making big changes to one's lifestyle impacts different thinking and behavior.
In my teens, I was a heavy-metal, hard rocking druggy, getting into all sorts of trouble, and missing school. This wasn't so much of a 'phase' that I went through. Being fascinated by dark morbid stuff started way before I hit puberty. When in my pre-teens, this thinking and behaviour started becoming more personified in my personality, and gained in strength. When in my teens, I was pretty heavy into gothic, dark stuff.
There did come a defined point where I finally decided that I didn't like it anymore. I was sick of it, and wanted to be something better. I just remember that my mind was growing darker and more morbid, deathly and gothic. I also had a hard time keeping myself in control. When I extrapolated this pattern, I felt uncomfortable about the future.
From that point, I made a lot of significant changes to my lifestyle, and gradually felt really good about it. I vowed to myself to stop drugs for good, stopped hanging out with some people, and attempted to help others and myself more. I also turned to studying the bible at that time.
There has been a lot of different things happen since then, but right now, I feel more in control, and stable. A little more matured and wise. I have much different views and outlooks than I did back then.
Now, I need to do another lifestyle change to quit smoking cigarettes, and get into better shape.