Here's why:
* Personal narratives are considered creative writing. Creative writing pieces, like short stories, novels, and poems, use *italics* for titles.
* Academic and professional writing uses underlining. This includes essays, research papers, and reports.
However, there are some exceptions:
* If you are following a specific style guide (like MLA or Chicago), it's always best to follow their guidelines.
* If you are submitting your personal narrative to a publication, check their submission guidelines for their preferred formatting.
In general, though, you can safely assume that *italics* are the correct format for the title of a personal narrative.