I'm not a poetry expert, so take this all as my opinion instead of constructive criticism intended to help you write a better poem.
First off, why is the narrator able to see the crowd as she falls from the cliff when they were miles away from it a few lines earlier? Either they're next to the cliff edge or they aren't. And if they are next to the cliff edge, why are they gathered there in the first place? Somebody might accidentally push someone else off the edge.
For being so dark and sad, this poem has a lot of inherent energy. One of the creative writing professors at my university that I had a class with would often say that each line of a poem should be thought of as going for a walk. If the lines are short, the reader is going at a brisk pace, with lots of sharp turns. If the lines are long, the reader goes at a more leisurely pace, and the turns they encounter are gentle and broad. I'm guessing you're averaging about 5-7 words per line, so the reader of your poem is being taken for a quick walk. When your narrator gets depressed and turns away from the crowd, it seems to me that the lines should get longer and longer, to really get across how lonely and sad she feels, how she doesn't really want to walk away from that crowd, and wants somebody to come look for her.
Of course, I don't know what you were trying to convey to the reader of this poem. I often misconstrue the meanings of poems.