Last nights dream

I have a lot of peculiar dreams. I don't remember them often, but when I do, they're weird.
Really weird.
They often make no sense, so I've decided to face the challenge of writing it down in such a way it will make sense.
If you enjoy it, you can let me know in the comments, twitter or Facebook! If not, I'll most likely write another if I enjoy writing this one.

I was so excited. I was running up a rather magnificent set of stairs, with a group of friends I don't recall, most likely because they don't exist.
"I can't wait to see this!" I gushed. "I wonder how they made this into a film? I heard the game had over two hundred endings."
I was talking about the game Until Dawn, which, in my dream had obviously been adapted into a film.
Then we got up the stairs, and we mindlessly walked whilst still bursting with excitement, and then we walked in front of glass panes and the nightmare ensued.
There were all the characters, flailing, panicking, balancing on a stool, a noose around their necks. I originally thought it wasn't real, but then we were forced to choose which one to kill. I can't remember who chose a character or why they were chosen, but I remember having a panic attack. I ran away from the panes, keeled over, gagging, sobbing.
This is where the patchiness of my memory ensues, which is often why my dreams often don't make sense.
We were in a mansion. A very sombre, discomforting place. After a long walk, we ended up outside, a huge forest in front of us. A forest where you could get lost and never be found. A forest where you could be brutally murdered, and no one would hear your screams.
I again panicked, and for some reason my history teacher sat beside me.
"How do I get out if I don't want to do this?"
It was if a grotesque killing spree was about to ensue. Endure and survive. A hunger game type of event, except only one mysterious person would eventually kill us all.
I had fallen at this point and I watched as my friends left me behind.
Answering my question, he said
"You can't. You have to go through this."
I remember thinking I could just go back to the house and leave through the door. But apparently I couldn't.
And so the dream ended.