The speaker begins as a frightened voice pleading for help. Monsters are staring, laughing and whispering, and the short, repeated lines ("Make them stop / Make them stop") sound like someone too panicked to find new words. The speaker is alone, cold and starving, which makes the plea feel even more desperate, since nobody is there to answer it.
The last three lines change everything. "But wait a second / I know this place / This is my mind." The monsters are not outside the speaker at all. The place of the nightmare is the speaker's own head, so the staring and whispering may be their own fears or harsh self-judgment. The poem doesn't say what to do about that, and the realization is both a relief and a trap: if the danger is inside, there's no door to run through. The mood is anxious and isolated, but the ending leaves a small spark of awareness, the first step toward taking back control.