What's the difference between telling your own story vs. someone else telling it? In a paragraph please

The difference between you telling your story is that first of all it is in first person perspective. If someone else tells it, they will say it in third person perspective. Another difference is that if you tell your own story, then you can share your feelings on it. If someone else tells your story, they will not be able to communicate your feelings. Additionally, if you tell your own story, then you can easily be able to write your story. On the other hand, if someone else writes/tells your story, they will not be able to include all the details.

Explanation:

in our power to make a world happy - to teach mankind the art of being so - to a character hitherto unknown - and to have, as it were, a new creation intrusted to our hands, are honors that command reflection, and can neither be too highly estimated,