How we cite our quotes: (Line)
Quote #1
I am—yet what I am none cares or knows; (1)
Nobody knows what the speaker is, and nobody cares. Sounds like most people have given up and left him for good, even though he's still alive and kicking (he says "I am" twice in this one line alone!).
Quote #2
My friends forsake me like a memory lost;— (2)
The speaker's friends have abandoned him "like a memory lost." His friends are mean; they don't even see the speaker as a person or friend, just as some forgettable memory. Yikes!