I hate to tell you, but you have a big problem. You're too nice.
It's true! You're so darn charming, considerate and agreeable, that you've been branded with one of the worst qualities possible in the workplace.
You're nice -- undeniably, reliably, terminally nice. So, what's so bad about being nice, you ask. (And it's very nice of you to ask.) To answer, I refer you to a recent careers column by Rachel Emma Silverman in The Wall Street Journal. The headline for the column says it all, "Hey, You! Mean People Earn More, Study Finds."
The study in question, "Do Nice Guys -- and Gals -- Really Finish Last?" was conducted by three professional professors from Cornell, Notre Dame and the University of Western Ontario.