You offer an idea; they give you a blank stare, and nothing happens. Moments later, someone else makes the same suggestion and the response is overwhelming. You sit in passive silence while your colleague receives the praise that should have been yours.
What happened? Why are some people listened to and their ideas acted upon, while others are ignored? Your knowledge and expertise are the equal of any. You've proven you can get the job done. All you need is to express your ideas and opinions in ways that make people sit up and take notice. You need to develop your own personal power, so your presence is felt, whether you're arguing a point or commenting on someone else's.