[supernova]

Destiny or not.. I believe in slightly modified 90:10 rule.
tht 90% of the time your action influence your future and 10% is the fate.
e.g some natural calamity, riots, or even a simple thing like train delay, flight delay happens. this you cannot control and are not even remotely related to you. However, they will affect your life such being late for a meeting or not able to reach some important place. These are 10% controllers in your life.

But major controllers are in our hand.. they way we react in a situation affects the future events to follow. How you perform in a job interview, how you react to your friends mistake, how you react if someone bangs your car... such type of events will majorly define your future series of events.