Rookies aren't tainted by rejection, negative assumptions or past experiences. Rookies don't focus on what everyone says is impossible. Instead, with wide eyes they believe anything is possible. They bring an idealism, optimism and passion to their work and because they believe in the future they take the necessary actions to create it.
Regardless of how much experience you have in your industry and profession I want to encourage you to let your experience be a blessing not a curse. Let your experience provide you with expertise and let your rookie mindset fuel you with optimism and passion.