There are many stories throughout history that have unlikely heroes, who may have been under estimated by some, yet not by themselves.  There are stories of people who discovered new worlds, individuals who defeated giants and people so resolved in their beliefs that they changed the world.  Most parents always taught their children to achieve beyond the ordinary. The issue that we run into at times is that we doubt our own ability to accomplish what might appear to be unattainable.  We have to remember that history has shown us many examples of what was actualized by a variety of individuals, who others may have failed to believe in initially.  However, all of those that lacked faith were proven wrong in the end.  Whether it is your ancestors or people in history that you can use as an example, remember that you too can achieve what may be impossible to others.  You have the conviction and ability to attain anything that you set your mind to.  Do not listen to anyone around you that says you can't.  If you have anyone around you that has doubted you, then they are simply not the people you want in your inner circle.  Let your legacy speak for itself as you deserve what you dream.