Are we Masters of our own Destiny?

We do what we want. We do what pleases us. We act as the situation demands at any given time. We control our thoughts and our actions. We are aware of the circumstances we are faced with and act accordingly.

Are we actually our own masters? Are we masters of our destiny? Do we get what we set out for? Do we get what we deserve? Or are there external and invisible forces that help us? Are there forces which which act against us? Is all that happens to us and in our lives the same what we had desired, or is something else taking control of our lives?