The Celestine Prophecy by James Redfield and the following books in the series are all worth the read. I picked up my copy for the first time when I was in my early teens and it completely transformed my life. I began to understand how my relationships and just daily interactions with the world changed how I was feeling. I soon realized I was overly sensitive to the energy exchanges happening. Through the books I learned to recognize healthy energy relationship and how to deal with unhealthy ones. They also sparked my understanding of energy healing in general. I use many of the techniques illustrated in the books to this day and still strive to achieve some I have yet to master.
Its also been made into a movie for you non-readers: http://www.imdb.com/title/tt0398842/