My grandparents mostly raised me too. I had thoughts of murder and mayhem but my Grandparents taught me to respect others to help others and to obey the law. I joined the Marine Corps for just that reason and have never in my life hurt anyone or robbed anyone. I have delusional Paranoia and one of the voices I used to hear used to encourage me to rob and cause harm. I never once gave into that voice because I was taught not to. How about you?
You were fortunate that your Grandparents raised you well. I, too, was lucky, but with the conventional two-parent scenario. My parents worked, taught me, gave me love. I realize how lucky I am, and while I take pride in the choices I've made as an adult, I know it is the solid foundation that my parents gave me that made those good choices clear to me. I also know not everyone is that fortunate.