Walking vampires

When I was a child, everything was rosy, my life was perfect until I saw the most horrible thing in my life. Someone who killed a person by biting them on the neck. I know that's like a vampire but they don't exist. I know they're not real, but What's more, that man bit me too that was when I was 18 years old, I woke up the next day and I felt the same but I remembered what happened the night before, thinking it was a nightmare until ...