Hiding pain behind "I'm fine" is the starting point here. The speaker says they're okay while tears are plainly running down their face, so the words are more of a habit or a shield than the truth. They say they try hard to stop crying, but most of the time they aren't strong enough, and that sense of failure feeds a harsher belief: that they are a "useless waste of air."
The title's "superpower" idea gives the poem its turning point. The speaker once wanted to read minds, which suggests curiosity about other people. Now they would choose to evaporate, to stop feeling anything, even briefly. The poem is careful here: they ask for relief "for any amount of time at all," not necessarily forever, though the earlier wish to drown sounds darker. The mood is tired, raw and honest. The plain, unpolished language, with its short lines and casual spelling, makes it feel like a private confession rather than a performance.