The speaker wakes up each morning surrounded by frowning faces they can't get rid of. They stretch and crack their neck like any ordinary start to the day, but then notice they leave no footprint, which suggests they feel invisible or unreal. From there the poem slides into darkness, with every turn leading the wrong way.
The frowns act like a crowd of judges. They mock from behind, poke at the speaker's shoulder, and when the speaker turns to look, their faces are blank and dark, showing only sadness. As they close in, the speaker's thoughts turn guilty ("all just sins") and their actions no longer feel like their own. The ending, sitting on the bench waiting to pitch, suggests being sidelined and left out of their own life.
The mood is anxious, trapped, and lonely. The repeated "i can't shake em" gives it a sense of being stuck. The title's warning, "Never Let Them in," hints that the speaker let these judging voices take control.