The Destiny

Its sure that destiny could not be changed, cause mostly we never know for sure … what kind of fact we would face for. But for somehow we could create our destiny by our own scenario.
The point of view was hidden inside of limited power that every being have. But something that flow so naturaly within the law of action-reaction, the one who truly understand the universal law, would understand what kind of reaction he/she would get by his/her appropriate action.
Then could you imagine that we could create a destiny, event a small one?