The speaker feels trapped in a kind of frozen half-life. Water, at the start, is described as still and not alive, and the speaker remembers once being "one with" it, resting in peace in a time before time. That memory sounds calm, almost like being unborn. Now the peace has broken: the speaker rests "in peices," which suggests being fragmented or damaged as well as dead.
The oyster image hints at something protected and possibly precious, but the world has replaced it with a grave. The speaker imagines that if stories were true, the grave would burst with life and a prince would arrive to rescue them. Instead there is only a morgue and a slumber that never changes. "Never growing old" turns a fairy-tale wish into something cold and hopeless. The mood is numb, bleak and quietly bitter, with a flat tone that makes the stillness feel heavier.