In first person, the narrator tries to convince the audience that they (the narrator) are the point of view character.
The most natural use of first person is when we tell stories about our own lives, because we literally are the point of view character (even if we lie about details in the story).
This is a form of story that we might call an account, recount, memoir, or autobiography, depending on the context. (As opposed to narrative, which is purely fictional.)
Here's an example from Growing Up Disabled in Australia: