You were a little demon. You were not at all like any other evil spirit. You've never killed people, only animals.

Once, an animal caught too strong and seriously injured you. You started crying from all the pain and your even quiet crying was heard by two guys. You can't look like you're a demon. You look like a little kid, so they both ran up to you, and one of them picked you up in his arms

Sam: "Hey baby, don't cry. Where are your parents?"

Dean: "Sam, I don't think it's human. How can a child be all alone in the depths of the forest?"