A childhood belief about imaginary friends

I used to have an imaginary friend called Hannah. The reason why I made "Hannah" was because I used to be friends with this girl called Holly, but she went off with another girl and I wasn't very popular in primary school, so I was lonely, so I made Hannah up. She wasn't especially weird, she was just a girl about my age with black hair, but for some reason she never had a mouth. Also, she sometimes wouldn't have a nose either, and sometimes I wouldn't call her Hannah but refer to her as 'Natalie' or 'Natasha' but I forgot about her whe I was about 7 because a new girl, moved to our school and I made friends with her instead. But sometimes when she was absent Hannah would come back again, though she didn't really talk or anything, she was just 'there'.