Experience on beach

I was sitting inside during the afternoon right next to the beach and I bought epictetus works 2 days I go. I got fed up of bed and took a fairly long walk with a journal , the enchiridion, and a pen to study and journal. It was perfect and I was making notes on how you should practice your philosophy but then my pen started giving up and I kept on trying to write and I was getting more and more angry(I have the paper still and can show it as proof ) and then I realized that the pen was external and out of my control and I should focus on what I can and that was reading the book I had.And then I went to reddit

Sorry if this doesn't have to do witch Stoicism at all or if I'm misinterpreteding.Can you let me know if om interpreting it right