I would love to help you! I deeply enjoy writing but the problem is, I can't! As a writer I understand that not everybody finds passion in the same things as I do, but if you put your heart into it, you will do great! Although I can't write the entire thing, I can give you some tips on writing this story:
-Try to make it personal. If make-belive isint your thing then don't create something, base your story of of your own experience. I know it says fictional but all you have to do is change around some names and add in some small details and there you go! It's fiction!
-If you never went through such an experience you can search online for stories of people who became very sucessfull although they did foolish things in their younger age. You could base a story of of one of thoes stories (just remember- never copy anything word for word!) or you could mix together some of those stories to create your own!
-Don't rush it! If there is a deadline try to make a schedule that works for you and your family, but, if you are like me and stuff pops up all over the place, work on it whenever there is time! You don't have to make it perfect, just write whatever comes to your head.
-If you still can't think of anything, talk to a teacher. They will be happier if you turn to them instead of turn in nothing becuase you couldn't figure it out and didn't want to ask for help.
I hope these helped you! If you have any other questions feel free to comment on this and I will try to answer it!