here are some more links that will help you understand what exactly graphic design is:

here is a site by the aigi about what in the world graphic design is http://whatintheworld.aiga.org/

this blog has been created to get definitions from designers about what they feel their profession really is

another blog to help clarify graphic design designtalkboard

here is davidairey’s take on graphic design

jacob cass’s definition and blog

this site is amazingly designed, one of the best interactive sites ive ever seen, not really on the idea of what is graphic design, but exactly that at the same time, http://www.hejz.com/

one last site dedicated to help define design, www.cairril.com

these have all helped me understand that everything is design or had to be designed by someone, which is not only helpful in understanding graphic design but encouraging to know that it is in fact everything