It occurred to me in my junior year of high school. I got my first letter from a big college. I still have that letter to this day - a letter from Indiana.
By the time a person has achieved years adequate for choosing a direction, the die is cast and the moment has long since passed which determined the future.
I don't even think whether I play the blues or not, I just play whatever feels right at the moment. I also will use any gadget or device that I find that helps me achieve the sort of sound on the guitar that I want to get.

