I like the title, and how it plays into the sociopathic main character.
Writing from first person can be difficult, but you've got off to a good start. There was some meandering parts, and portions where your character is repeating himself.
A little more critique; if this is to serve as a prologue/first chapter there is probably too much info-dump. For example we don't need to know he was an orphan, or the rest of the background given. Secondly, I think you've fallen into the trap that makes first person POV so difficult; you 'tell' rather than 'show' - we're told about his dad, we're told about his upbringing, we're told he cares for his sister.
Also - your format; is he writing this in a journal? A biography? A confession? This will change how you write, and you need to decide why your character is writing also. And finally, there is no indication of a plot (which will undoubtedly tie into the above about why the character is writing) perhaps ending the chapter with something like
"Thus begins my story, my recanting of the days and weeks that led to my confinement in this fine dungeon. I have never begun to write with so much dread..."
Do I make sense?
Looking forward to the next instalment