"No one is adequate to comprehending the misery of my lot! Fa..." — Matthew Gregory Lewis quote meaning

No one is adequate to comprehending the misery of my lot! Fate obliges me to be constantly in movement: I am not permitted to pass more than a fortnight in the same place. I have no Friend in the world, and from the restlessness of my destiny I never can acquire one. Fain would I lay down my miserable life, for I envy those who enjoy the quiet of the Grave: But Death eludes me, and flies from my embrace. In vain do I throw myself in the way of danger. I plunge into the Ocean; The Waves throw me back with abhorrence upon the shore: I rush into fire; The flames recoil at my approach: I oppose myself to the fury of Banditti; Their swords become blunted, and break against my breast: The hungry Tiger shudders at my approach, and the Alligator flies from a Monster more horrible than itself. God has set his seal upon me, and all his Creatures respect this fatal mark!