Remember that you are an actor in a play, playing a character according to the will of the playwright — if a short play, then it’s short; if long, long. If he wishes you to play the beggar, play even that role well, just as you would if it were a cripple, a honcho, or an everyday person. For this is your duty, to perform well the character assigned you. That selection belongs to another.”Epictetus, Enchiridion, 17
Play the hand you are dealt, and play it well. It is the only hand you get. This is the lesson the Epictetus is trying to impart. The book goes on to mention that accepting and fulfilling our part is not at odds with ambition which is not obvious at first glance. After all, if we are assigned a part then why try rising above our station? If we must play the beggar then how are we not locked into such a poor life?
There are many stories where the mighty fall, and there are many stories where the less fortunate rise. You may be assigned a part when you enter the story, but the story itself is not yet written. The question really is this: what do you want your story to be? If someone tells your tale, what will they say?
In order to change your story you must first accept and understand the role you have been tasked to play. You cannot change where the story starts or where it has already been, but once you are in control then your story will go wherever you wish.