Every detail you've experience, and/or people you've interacted with.
I do. I believe that every single elementary school, middle school, and high school teacher made an impact on my life, and ultimately led
me to who I am today.
For example, I have had a band/music teacher, and I've had him for about 4 years, playing trombone (best instrument ever), and ive played for 8 years.
Anyway, I really didn't think of it much at the time, or even shortly after I graduated.
But as time went on, I started to miss playing music. Then I realized how much just even playing a simple instrument made my life into it is right now.
Do you ever wondered about that stuff