I need to write a letter to my past and future self, but my teacher specified that it needs to be written in the first person point of view. It must also be written in a conversational style. It must be written in a monologue style, and it should be as if I am talking to myself.

How should I do that? Usually in letters to past and future selves, we use the word "you" but that's already a 2nd person point of view.

Should I do something like,
Dear past self, we were annoying, or
Dear past self, I was annoying

Or would it still be a 1st person point of view if I use the word "you?"
Dear past self, you were annoying