I would highly recommend the book by Barbara Sher "I could do anything if only I knew what it was" (full of spot on excercises and useful ideas about finding out what your talents are - you will LOVE it), the Paraliminals will help you to free your mind from psychological barriers. The best Paraliminals for you in my opinion are:
Getting around it
New Behavior generator
Automatic Pilot
New Options generator
Self esteem supercharger
Personal Manetism

Cheers
Annie