I just read:
"Manager:
Blah blah blah, I'm a whiny little prick who tries to sound intellectual/witty while writing a letter of resignation.
I am a little girl and can't handle real life. I want to quit."

just messin...(sorta)
Actually, get rid of the first two paragraphs. After reading the first paragraph, I would not really be interested in reading anything past it. You come off as a snide ass and I'd just terminate your ass right there. I mean, you try to be clever by adding in the "blind man" bit and then to finish off that paragraph, you add in another smartass comment about good china. It's too much for a small paragraph.
And don't give him your life story on why you want to quit....that's just utterly pointless...
A few lines of why you need to quit (ie school load) and say thanks for a great work exp and shiz, wish him the best of luck and boom you're done.
Bottom line, you're too much of a smartass dick the way you wrote it just now.