If you want to advance your career and get ahead, you need to do some self promotion. Maybe you don't feel comfortable talking about yourself, especially "in that way". Don't worry. This article from Glamour, How to Sell Yourself at Work (and Not Feel Sleazy), has great tips for women in the workforce. They are good tips for men, too.
Here's a slightly different aspect of communicating at work: Networking: Better than office politics