Steven Covey realized the important of this and include this in his Seven Habits of Highly Effective People.
1. Yes, people can change himself and re-emerge as a renewed and a better individual.
2. The 7 Habits starts with set of principles, the first is "Be Proactive". Simply said, that there is a "space of opportunity" that you can make the choice to respond to a given environment. The space can be at first "small", but given time, you can work to expand it.
3. The Gurus have been arguing whether we are the products of nurture or nature. Whether we are the prisoner of our past, moulded by the circumstances of our upbringings. Steven is firm to say that we are the creation of our own choices. We may be raised a certain way, but we can still make the choice. The space of decision is in our hand.
Does is mean that you are total in position to determine your future? Does it mean that the there is no such such thing as "FATE" or "destiny". In my opinion, what Steve is promoting is closer to the Muslims thought that the Christianity. Christians believe in the "Original Sin" that a newly born has to be baptized to clean him/her. Muslims do not believe that sins or virtue are inherited. People are given the ability to choose, and you will be rewarded or punished for your choices.
So the choice of your path is in your very hand...