Sorry is a poem about a speaker who feels they are never good enough and who takes on blame that isn't theirs. The opening apology quickly turns inward: the speaker is "trapped inside my own cage," filled with regret, hate and a sense of failure. Even "sorry" feels useless, and the line "I hate you" turns out to be something the speaker says to themselves.
The second half shifts to another person, someone the speaker calls "an angel" and "a saint." Yet the speaker cleans up after this person's mistakes and says they were their own. The poem suggests this is a habit, since "that's what I'm used to." The final line sounds almost like an instruction the speaker gives themselves: take the blame so the other person doesn't have to suffer.
The mood is heavy, quiet and resigned. Short, flat lines make the self-criticism feel automatic, and the cage returns at the end to show that the speaker hasn't escaped it.