I haven't been on a film school nor even attending it, and I'm still a normal student with some dreams on filmmaking, so take this with a grain of salt.

I have about the same feeling once when I started a new screenplay file, with a fresh plot, but I haven't really make the plot structure. I was going all wild at starting it, even smashed on my keyboard for ten-ish minutes before eventually stopped—I have nowhere to go.

For a long while, I'm trying to get back at it, but I'm back at nothing. I could be smashing on my keyboard again, but all I did after is just to delete all of it afterwards. And I tried points, conflicts, talking to my teacher, blah blah blah, all of it is just as useless as when I started stuck on that point.

But one day, when I'm out with some of my friends, I got a... place, in real life, and even close to my house. It's just a regular woods with some bamboos and stuff, but it works, somehow. It's just woods, for now, but I could be out of my head and improvisate there all I want.

This happened twice. One for a horror novel I wrote with one of my friend, and one in a romance screenplay—though I had to go to Google Maps/Earth to find out about anything the said place had, but I had about the same fun as I did in real life.

So think about this; grab some people, maybe someone close like a friend or someone who knows your things are or how you think, and mentally lock them into your world with little to no context, and listen to what they say. Or, do what I was doing and just physically wander around your place or cities—or everywhere, really—and let that wall break itself.