Here is my experience with writer's block:
To help overcome the "nothing to write" syndrome, I like to read books and imagine a different ending or different characters . . . or put my own characters inside of a story or TV adventure (or movie). That gets the imagination jump-started. It's a little bit like what I'm doing with the story-writing contest here. I've already created Andi's "world." You readers need only make up some fun adventures, without having to create every little detail of that world. That makes writing a bit easier.
|Me as a young teen|
I also liked the old TV show Star Trek when I was a young teen, and I wanted to live on a starship, so I wrote a bunch of Star Trek stories for me to read and dream.
The point is . . . you don't always have to write a story from "scratch." (That's why there are thousands of "Fan Fiction" stories on the internet.) It's okay to expand an already created universe to get your writer's block under control. Soon, like me, you'll be making up other stories all on your own!