The speaker is talking directly to someone they blame for their despair. The question "Does that feel good" is bitter and accusing, as if the speaker wants that person to see the damage they think they've caused. But the question also sounds exhausted. There is little anger left, only hurt.
The poem moves from giving up, to thinking about death, to self-harm. The last lines, about a new scar on the thigh, make the pain physical and ongoing rather than just a passing thought. The repeated "feel better" shows how the speaker's emotions have narrowed down to one painful question: who benefits from their suffering?
The mood is raw, bleak and very direct. There is no decoration, which makes it feel honest and hard to look away from.
If this resonates with you personally, please consider talking to someone you trust or a local crisis line. You don't have to carry this alone.