This May Not Look Like a Good First Sentence...

...it could still be - and it may be the biggest test of your mettle yet.

Use this as the first sentence of your soon-to-be short story:

"This wasn't really my first sentence - and I didn't think I wanted to start this way - but surprise, here I am!"

Make sure that your story contains at least two other characters besides you, and make sure that you actually have a story (and not a random collection of thoughts that would turn this into an essay).

Good luck and happy writing!