I'm Fine

[Bmce]

I had the same question as Cloud, as the "It" is referenced in the first, fourth and last line. Clearly, the narrator is not fine ("I keep it hidden, boiling, festering") or at least is passionate and I don't think you'd be giving anything up by sharing what "it" is (masturbation? cutting? singing? writing?) if only to have greater control in your work, before letting others decide your intention.
I like the compactness of this as well as the control over the acrostic.

Thank you for sharing.