Writing about your own life is like walking through murky water. On one hand, you are employing some of the techniques of fiction. Dialogue. Description. Setting. Character Development. Theme. Symbolism. Story arc and plot. Scene, scene, scene. Internal monologue. All of these come into play. And then there are the smaller, detail-oriented things like cadence, sentence variation, and playing with language in an artful way that expresses what you want to say.
And yet, it’s not fiction. There are limits on all of the above elements (except perhaps the language and sentence levels). Your dialog has to match, more or less, the dialogue as you remember it from real life. Your character development is limited to how much you’ve developed your insights and observations about the people around you, how closely and in how many dimensions you’ve paid attention.
Your story arc often won’t fit the more linear traditional arc. That can be one of the trickier things to work with. I think you do need a fair amount of crafting to make the raw material of your life into a story worth telling. You can’t just vomit out exactly as you remember it happening because life is so messy that your story would end up that way too. At the same time, I think it’s dangerous to control the messiness too much, to work too hard to fit things into and expected and accepted story arc. Doing so can push you too far into fiction. There has to be a balance between free-flowing creative energy and craft. And the more you write, the more both come naturally.