Letters to an "imaginary friend"

Hello folks,

I'm a bit struggling when I journal the way I do. I mean, just writing what I think, my issues. It feels like "ok, I know it's good to me, but I don't feel it that strong".

Recently I was thinking ... What if I write letters to someone ? It would be more real, like a soldier during a war (a bit extrem I know, but it's the first example I have in mind), but I don't really want to select someone I know, because I know I would limit myself. So an imaginary friend.

The question is, for the ones doing it already, do you think I need to give him/her a lore ? Okay, I have a name, but I feel like it needs a story behind it. I don't know. I don't know if it's a bit weird, but I think it would be the best to me.