Irregular meter: 8, 4, 8, 5, 8, 5, 4. I can't tell if the change between 5 and 4 is deliberate or if you just weren't being careful with the meter. There's definitely a plausible pattern. No problems with the rhyme. Given the prompt, of course everyone's writing 7-line poems. As to meaning, I think it has something to do with holding on to hope even when there doesn't seem to be any. A time-worn theme, but still a nice sentiment.

There's a bit of ambiguity here but the subject seems to be psychological. Shame? The shortened final line gives the poem a claustrophobic resolution.