No writer knows how, or where the story they write will end. They don't know in the beginning as they write their first words, they don't know in the middle because they are consumed in the story they are telling.
But they do know in the end.
When they write two simple words that make the reader close the book and sigh, two simple words on the last page.
The End.
That is when they know. And the writer hopes that the story that they have written with their own two hands will be told again and again. They hope people will enjoy their story. Even when the reader reaches the end.

Never focus on 'The End' when it is only the beginning. Focus your heart, time, and energy on the beginning and middle.
Then when your done, you will be proud to write the words . . .
The End.

Everyone has a story they wish to tell. You just have to have enough courage to write it and tell it.