I talk about branding, and how it's important to build the brand that represents you the best, and shows what you want to do or be in the future. I heard a great quote from Catherine Kaputa, of selfbrand.com. She said
"If you don't brand yourself, someone else will."
That's very true. People form impressions of you, they conceive their own notions of who you are and what you are good or bad at. They pass these thoughts and feelings along to others, and those impressions may not be what you want.
You can't change all the opinions of you, but you can do the best job you can to present yourself the way you want to be known. If you do that often enough, and consistently, you should make the best impression for your career.