One of my first lessons in writing was how important it is for me to allow myself to write a really shitty first draft. The reason it's so important that I do that is because ALL of my first drafts are really, I mean REALLY, shitty.
Try Mandi's suggestion above, and see if you can't get it moving that way. Don't expect to have much of a "real" story, but I guarantee that you will likely have what most of us start with: an overall idea and a few plot points. From there, you start filling in the gaps and revising what doesn't work. People don't usually just sit down and crank out a story when they begin writing, they learn to nurture, coax, and grind a story out of themselves.
After doing what Mandi suggests, set aside an hour to put your words down on paper. Don't worry for a minute how it looks or sounds - the main thing is to just get it down. Set it aside, give it time to germinate, then set aside another hour and come back and review what you wrote down. Resume filling in the gaps and revising things so they better match your vision. Don't ever expect to be satisfied, but if you keep cycling back to it, sooner or later you're going to read somethin you wrote and smile.
If you find yourself struggling, feel free to DM me and let me take a look at what you were able to come up with. Like Mandi, I won't write it for you, but I'm happy to try to ask some helpful questions that might stir your imagination.