Hehe, here's something I finally understood [stupid me...]
I saw nothing really wrong, thats because my eyes are tired, but I read it still and it's very very nice. And I do aggree with Crysi, I love the last 2 lines.
You have a avery clear voice and tone, as well as strong imagery. I would suggest rethinking the lines referencing the hallway. It dates you and the poem to school years. Poetry should be timeless.