Are you a product of nature or nurture? Stephen Covey would argue you are a product of choice. I would argue you are a product of all three. Each person has a personality, temperament and developed character. The character is a product of nature (genetics), nurture (surroundings' influence) and your choice of how you interact and respond to various stimuli. In other words, you DO have some control of WHO you will be and how successful you can be. BE PROACTIVE is a principle emphasizing that rather reacting to stimuli we should respond with principles and values in mind.
Identify what you would like to change in your life and BE PROACTIVE. Decide to choose differently. If you don't do things differently day to day, your results will never change. However, if you decide to get different results, it will require you to choose differently when interacting with your surroundings each day.
As Dr. Martin Luther King Jr stated, its always the right time to do what is right. Choose right values, right friends, right decisions, right actions, right words, right attitudes, etc. Don't be a passive victim of your surroundings. Choose to be someone successful! BE PROACTIVE!