I think what strikes me about the first stanza is the comparison between the beauty of the nature you describe, "It is beneath the purist light of the midnight sky...." with the obvious sadness, ".....my very first tears fall, landing upon the ocean rocks."
Wonderful imagery here, by the way.
Then in stanza two, imagery, nature and sadness are written of again but hidden secrets are now introduced as well. The plot thickens. I love the idea of truth being "trapped inside a snow-globe".
I think the third stanza begins to show that perhaps this beautiful light/nature is the healing that has long been missing. There is an acknowledgement in this stanza that you have never allowed yourself to cry, but we know also from the first stanza that, in this light and at this time, you have shed your first tears.
Then the idea in the final, releasing stanza - which is a relief to read - of your tears and troubles leaving as you "weep out your secrets" and watch them "drift away". Again, acknowledging the healing powers of nature and the listening sea.
Great write Saffie, full of wonderful imagery,
Ben