Who am I?

Why am I like this?
Why do I push, push, push?
Why do I feel the need to get inside of your brain,
So entangled like a venomous spider?

Why can't I stop digging?
Digging a bottomless pit where your heart remains.
Digging, digging, digging.
Until disgust comes across your face.

Why do I do this?
Who made me become this monster?
Who created this Frankenstein's monster?
Who took away the gleam in my eyes?
Who replaced it with a hungry desire for reassurance?

Who am I?
What am I?
How do I destroy it?