Attitude vs. Ability
The popular poet, Maya Angelou, is known for saying: “I've learned that people will forget what you said, people will forget what you did, but people will never forget how you made them feel."
Tuck this quote away for future use.
No one cares how much you know, what college you went to or how much better your solution is, if you don't know how to speak to humans. Tigers growl at each other; people speak. Most languages have millions of words for a reason. Your co-workers have automatic "off-buttons" when someone doesn't approach them like a human being. Yes, facts are facts and what you're saying might be superior, but people tend to listen to approachable people. Confidence means having the respect of your peers, which means things can be said in a respectful way.
Motivational speaker and business coach, John Maxwell, said something interesting: "If you fancy yourself to be leader, it's wise to turn around every know and then. Otherwise you're just a person taking a walk." If you think yourself to be confident and no one listens to you, its time to re-evaluate your definition of confidence. Attitude is everything when dealing with people.