A person retreats to a corner or a dark room, but not because they truly want to be alone. The speaker admits the real reason in the last two lines: they're hoping someone will notice and ask, "are you okay?" The withdrawal is a test, a quiet way of checking whether anyone is paying attention.
What the speaker feels is a mix of loneliness and vulnerability. They seem unable to say "I'm not okay" out loud, so they stage it instead, going somewhere hard to ignore and waiting. The phrase "just to make sure" suggests they half expect the answer to be no, and that doubt is what makes the poem sting.
The mood is hushed, tender and a little sad. The short lines and lowercase, spaced-out punctuation make it feel like a private thought, something whispered rather than announced. The question at the end is small, but the poem shows how much it can mean to someone who needs to hear it.