I haven't personally experienced bullying, but when I was in high school, I had a best friend who became a bully. I took a stand and took it upon myself to separate from her. I couldn't be associated with her because it wasn't the type of person I wanted to be.
As I'm sure you may know, I'm planning to become a spaceflight participant and have been recently approved to begin my spaceflight training by the Russian space federation having passed the necessary medical and physical tests.