Unfinished life

Chew the skin off my finger
'til I feel the pain in my fender.
You say things got brilliant
When you took some lithium.

My friend knows all the books.
She captured all my rooks.
Brave enough to die today
I list my goals so you can say:

Sweat sweet sugar on my strings:
Don't know what tomorrow brings.
I close the diamond inside
One day all of me died...