"This thought inside of me
They slowly tear me apart
This destruction only I can see
I've already lost my heart
A poison from the depths of hell
Not knowing how to die
So all the time deep inside me
I shout i scream i cry"

"These thoughts inside of me
would blend better with the second line which implies a plural

I slowly fade into nothing again
While all the time I'm crawling
As this world still rends
As I continually am falling
All the time I'm falling
I feel this feeling inside
This pain agony and emotion
Destroys my only pride

very strong finish, I can feel the emotion and sense a wise conclusion of what the cause is

well done