Possible new title:
What it's like
Can you comprehend what it's like,
To feel these pangs?
It's a bit choppy because you've split up one clause into two lines. The comma, no matter its purpose, is incorrect. "Comprehend" doesn't belong in a poem with to-the-point language, and "pangs" is such an obsolete word that it ought to be replaced with "remorse", and of course change the adjective to match it.
To endure the never ending stabs,
The stabs of a thousand knives.
The repetition is still an issue. This poem isn't one that should use repetition.
Can you even think of what it is,
To feel alienated?
Again, be careful when you break sentences in half. Try to do it when there's a new clause or a pause.
To feel abandoned like an old factory,
A harsher version of hell!
Choice of words is a bit off; this poem is supposed to be organic by the looks of it and you've thrown in the word "factory". "Harsher" is also becoming obsolete like "pangs".
Do you know what it's like,
To have yourself lose this,
Again, try to be careful when splitting up sentences. The comma's purpose is not to form unnatural pauses. And... what are they losing?
To have this fall away from you,
Taken by a parasite.
I still don't understand what they're losing. "Fall away" doesn't really sound proper. Try "taken away". I do like how you mentioned a "parasite", though. I've never thought of it that way.
Can you even hint at knowing,
The feeling of being eaten?
That's not at all what commas are used for - and try to replace the entire first line with something that doesn't sound forced.
Feasted on by a heartless parasite,
The scum of the Earth.
Kind of gross... to be feasted on by a parasite... try figurative language that's not as gruesome. Plus, there's not much reason to repeat the parasite line. "The Scum of the Earth" has nothing to do with the previous line, and it's kind of an abrupt ending.
Writer notes:
Better vocab'
Less-to-none repitition
Extra verse
Better Structure
More comments welcome