Well actually what's bookworm?
Bookworm is a popular generalization for any insect that supposedly bores through books. No, no, no.. we're not literally talking about that bookworm, but the other bookworm which means someone who loves reading books. They are also called bibliophiles.

How do I know  I am a bookworm?
If you go to the library and lookout for a new book to read, you're probably a bookworm. 
If you always hand a book or maybe read it while on the bus,  you're probably a bookworm. 
If you could finish any book in a month even in a week or days, you're probably a bookworm.