I'm sorry that you have that experience in your past. I'm sorry your friend was a jerk to you, misunderstood you, and hurt you. I'm glad you don't feel guilt or self blame. I hope you feel better soon.
There's a lot you can do to cope. Here are some things I thought of: 1. I hope you know you're not the only person with these types of hurtful memories and experiences in their past. You're not alone. 2. Can you distract yourself w a hobby or talking to a friend? 3. Maybe volunteer helping people who have it worse. Be the change you want to see.
"If you ever get the chance to treat them the way they treated you, I hope you choose to walk away and do better."