getting over the hump or my case the "fear"

as i sit here another day at the office, i think to myself, "i'm sick of just another day at the office"...
i want more than just "another day at the office"... tired of the staleness and complacency of a job, ready for a new adventure, somewhere down career avenue...

but how do i rock the boat and step out of the box, when i'm constantly bombarded by this tiny but ridiculously huge blockade called FEAR?  how do i get it out of my head, and out of my life?...  i dream big, but live small and i'm not speaking monetarily... YES an increase in finances would be wonderfully accepted, but an INCREASE in happiness at the workplace would be a million times better...

so why instead of applying for that job that may be challenging but definitely worth it, why do i shy away and "accidentally" but "on purpose" forget to submit my resume on time?  why do i continue to complain but remain stagnant?  how do i overcome this fear? 

you ask:  "what is this fear of?"...  it must be of success, of accomplishment, or reaching my full potential...  of challenging myself in a new work environment and loving it!...  so how can i continue to come to work each day, feeling as if i get dumber by the minute?... having to open a book, just to make sure i can still read, lol, pathetic but true...  do i really want to do this for the rest of my life? 

i write this for advice, for some assistance and help!...  maybe a description on how you overcame this fear...  any and all advice welcome... so please anyone and everyone who can offer a word of encouragement or just a thought... it would be welcomed and appreciated ;-)

i thank you in advance....