I shot my best friend 9 times when I was 15
I hope you are joking. Why would you shoot your friend?
Because i was afraid that he would do the same to me.
If you were worried your friend was becoming violent you should have found an authority figure who could help you. Shooting people is wrong unless you are defending yourself from something happening in the moment.
WTF I was just a kid, I didn't know what to do. I was taught this is what you do.
It is a horrible thing to shoot someone. Usually people look for any other option than that.