What does my dream mean?

Now, I had this dream a very long time ago, but now is when I realize how shrouded in mystery it is exactly. So, I walked into a grey city. It looks like a mixture of paris and new york. The people are all made of cardboard, and non of them are moving. Mind you that in this dream, I felt as if I had the same feeling of walking into my grandfather's old house... I have only felt that feeling once when I was very little, I can barely remember it. Anyway, in the dream, I walk into an old tea shop. Everything is grey and dark, but you can still make it out. The chairs are over turned and are lain against the tables by the seats. There's a room in the back, and I see a shadow walking around in it. So I run over and I just see an empty rocking chair, rocking back and fourth. I run out of the shop and into a little hill, and when I climb down, there's sand, and it's a beach. So I start running and I see a ledge, a tall empty space with rocks, and then on the other side is another ledge. On that other ledge, I see my best friend, waving at me. So I start running towards her, smiling, but when I start getting closer to her, she starts shaking her head no, telling me to stop, but I don't. I keep running, and then, when I reached almost the tip of the ledge, the sand crumbles beneath my feet, and I fall to my death. What does this dream mean? I've had it about 4 or 5 years ago. I'm 13 now...