I can't

I am a fan of how the rhyme scheme changes in this poem. All of the lines that have the '-ay' rhyme ending are not specific as to why the narrator can't stay. They are vague and the narrator refuses to admit why they can not stay. However in the last two lines the rhyme pattern changes. To me, It signifies a change in the narrator's tone. To me it seems like the narrator is admitting their secret. They are coming to terms with their turmoil.

First of all, emphasis on the fact that the character can't brings a certain conflict, an unquenchable yearning. That tension keeps building all the way to the end of the poem and then the resolution is just too raw. The poem kind of ends in a disappointing way. What is your depression? What gives it dimension? Your use of rhyme to change the tone of the poem was very well done.