I think I may have haunted a guy when I was 11
How do you know that it was you?
I feel like it was me  and it haunts me when I think about it.
Only the dead can haunt people. If you have a mental crisis you should seek professional help.
I'm thinking of going to a therapist today.
That's a great idea, seeking help when you are suffering mentally is a sign of strength. Good luck in therapy.