As much as I hate to call some people out... Including myself, WE. LACK. CHARACTERS.
For instance take one of my most popular stories about a nurse reader and slashers, the only known original character for background in that is a fellow named Jackson, I should have added in more background characters.
For example.
Bad; "a bunch of kids looked at me after I fell I felt so embarrassed"
Better;
"I fell in front of Samantha and Max's freind group, they laughed while I tried to get up off the floor and find my skateboard. Heat raised to my cheeks, I'd never been so embarrassed."The characters here are Samantha and max, while there characters may not be important to the sentence, they add dept and help you figure out who the antagonist may be if not already introduced, the antagonists you can assume will be Samantha and max.