Read the book "The Go-Girl Guide: Surviving Your 20's with Savvy, Soul, and Style" by Julia Bourland. It's all about the Quarter Life Crisis. The way the author describes some of the events in her life will have you saying, "I thought I was the only one....". It's a good read and it will make you realize that almost everyone goes through this period in their life.
ETA:
adpiucf- Bonus for you: the author of the book had quit her job to become a freelance writer.