You can narrate your own life, but you do that after the fact, not during it. Just as I can narrate a football game after the fact and now infer an narrative arc, and even intentionality. However, while living my life, and even while playing the game, I am not narrating. This difference is important (in relation to understanding what narrative is, and is also the foundation of ethics) because one is always happening now and the other, even with our grammatical tricks of using the present tense, is always was. It is easy (and trivial) to infer causation afterwards, even where the causation is wrong, and causation is the heart of narrative.
The second problem arises because it makes my life the centre of how I want to think about narrative, and then there seems a small step to thinking that narrative equals the world, and if it can’t be narrated then it either can’t be understood, or doesn’t matter. This could be as simple an issue as using ‘me’ as the measuring instrument for the discussion (my life is a narrative). We can narrate anything we like about the world, but this is not the same thing as what the world is. This is similar to my point that I can narrate the ‘story’ of the match, but this is not the same thing as what the match is. To make it blunt: I can narrate sex, but I think you’re an idiot if you think that is the same thing as experiencing sex or what sex is (or love, hate, anger, joy, hunger, being drunk, coffee, blue, the sky the other night, a lover’s touch) – though it would our lives much less complicated.
In a story everything happens for a reason. Everything. The reason is to progress the story to its resolution, to what we call ‘closure’. Realist stories (and the definition of realism) is to make this highly artificial model appear natural, so that it relies on coincidence and character and various ways of representing itself (e.g. hiding the fact that it is a made up thing) so that things appear ‘like’ life. But unless you think you live in the Truman Show, our lives bear virtually no relation to stories in this sense, every day they are full of real accidents, coincidences, and, well, life. For instance, in a story, you only get sick for a reason (they’re bad, it’s a moral reflection, the story wants to consider mortality), in the real world we get sick because of ‘reasons’ but these reasons are germs, bugs, malevolent cells, etc, not because I want to consider mortality – just as many ‘bad’ people get cancer in the real world and die as ‘good’ people, it’s an unusual story that does that.