I honestly have one regret from my high school years and that was the fact that I was horrid to my RE teacher. I trolled him for like 2 years straight, coming up with schemes and ways to disrupt the class and he was so innocent and kind that he kept falling for all of my pranks. And everyone took the piss out of him because of me. I feel so bad and wish I could take it back because the guy was genuinely sweet and caring and always saw only the best in people and did all he could to help others. He was the truest Christian I've ever met and I hope he is doing well these days.