Earth’s population: 7.6 billion.
Copies sold worldwide of Harry Potter and the Philosopher’s Stone: 120 million.
If a sale is a success, Rowling’s success rate with humanity: 1.5%.
(Think of it: 98.5% of humanity has not bought her first book.)
A starry-eyed dream: to be 1/100th as successful as Rowling.
In that case, ideal success rate with humanity: 0.015%.
Number of submissions needed, at that rate, to get one acceptance: around 67.
When a single story of mine has been rejected by 67 different magazines or markets, then I’m allowed to get bummed. Not till then.