Hey! Remember, a personal narrative essay is about YOU! You can write about anything that happened to you in your life, things like first kisses, first dates, or even about the first time you went to the zoo! It could literally be about anything, just make sure that YOU are in it!
So, a personal narrative essay always has to have a beginning, middle, and end, just like any other essay. But, unlike other essays, you have to write in first person. Basically, writing in first person is when include "I" in the beginning of your sentences. Also, don't forget to include a plot! Every good personal narrative HAS to have a plot.
And, last but not least, you need to include a conclusion! How is your story ending? How did this event (or whatever you are writing about) affect you, and how did it end? Don't forget, this isn't all what you need in a personal narrative, but these are the things that'll help you get started.
~Hope I helped, and best of luck on your essay!~