Swami Mukundananda
Is my life fixed by destiny or can my present actions change it?
Present actions are in your hands
Whatever your past destiny, you still have freedom to decide and act in the present. Your results come from this free-will action, your destiny, God's will and other factors together, so don't bring destiny to mind while acting.
The actions we perform in the present from our free will are called kriyaman karma. The results we get in life are a combination of our kriyaman, our prarabdh and the will of God.