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Custom function to apply bold face to a region

I know there is a function called: facemenu-set-bold, which is bound to M-o b, but I'm trying to write my own as an exercise. Here is my code:

(defun my-function()
  "this is my function"
  (facemenu-set-face 'bold))

When I select a region and call this function using M-x my-function, the region itself is not affected, only the newly inserted text is bold, can someone please, explain to me why.