How can i get LibreOffice to automatically number pages?

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Page numbers usually live in the header or footer. These "areas" are properties of the page style.

Considering the way your question is asked, I assume you're a newbie and have typed your short story without "fancy" formatting (all of it being done manually). The result of this is you have a single page style.

• Format>Page Style to open the dialog to control the parameters
• go to the Header tab (or the Footer if you prefer the page number at bottom of the page)
• tick the Enable footer check box
• OK

For convenience, I recommend you View>Text Boundaries and View>Formatting Marks so that you cann see how your page is structured. All the cues do not print, so that you can keep this hint always enabled.

Click in the top part of the page, above your text. This will put the cursor in the header.

• Insert>Field>Page Number

After the field is inserted, you can format it with text before/after, tabs, ...

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