That's... Not something most people do...
Are you sure?
Nah, it's just you !
OP, are you okay?
Think about how mother's always talk to their kids in third person, or how elders talk about themselves to others in third person
If I'm not mistaken your thinking of story's like "when I was your age" or "a few years ago I" which is still in the first person just in past tense.