The lines "My heart, like something supine / That has been hunted, caught, and lies" suggest that the speaker feels trapped, vulnerable, and powerless. The comparison of his heart to something wrapped in "hind'ring shrouds" implies that the speaker's emotions are constrained or suppressed, possibly by external circumstances or personal fears. The use of the word "supine" suggests a sense of weakness or submission, as if the speaker has been defeated or overpowered by something or someone. The phrase "hunted, caught, and lies" suggests that the speaker has been pursued or targeted, and is now at the mercy of his captors. Overall, these lines convey a sense of helplessness and desperation, and suggest that the speaker is struggling to cope with a difficult or oppressive situation.