The speaker is fed up with being told everything is fine. The poem opens and closes with the same demand, "Don't try and tell me. 'It's okay,'" so the line works like a door shut on both ends. Whatever the speaker is feeling, they don't want it brushed aside, and the question in the middle, "That I feel this way?", suggests they're tired of having their feelings treated as a problem to be fixed or a mistake to be corrected.
The two lines in between show how bad things seem from the inside. The speaker describes themselves as "a lifeless body left to decay" and "an emotionless mind lead astray." These are bleak, numb images, and they suggest someone who feels empty, hollowed out, and drifting. The rhyme on "okay," "decay," and "astray" gives the poem a tight, almost chanting rhythm. The mood is weary, defensive, and raw, like someone who has said this out loud many times and still isn't being heard.