This is very good.  I especially like these lines:

They are untethered ships,
unmoored vehicles from
which I am in danger

of plunging. 

I love the metaphor, and how you continue it at the end of the poem.  The last lines also seem very important; they completely change the overall meaning for me.  However, in the last two lines I would change it from "they weigh so much, / it means something" to "they weigh so much / that it means something."  Something small, but even (and especially) the small things are important in poetry.

I really like this. You've captured so well how a little gesture can mean the world to someone who is alone and depressed.

I love this! It's very well written, and the pieces of information you volunteer about the characters make me feel like I know them even though you never really introduce them. This is a beautiful poem; I just wish I know what it is about. I feel like every time I read this I understand a little bit more of the underlying plot, but I guess that's what poetry is all about!