what does surrender really mean ?

Many things were moving so quickly, a combination of unexpected pleasure and pain.
Unlike the past, now I view myself as some kind of an observer of what’s happening to me, without taking part in it. I was just watching life as it unfolds.
We never know what awaits us the next moment; Life seems to be a combination of pleasure and pain based on once karma. If life is just viewed as a series of events of unfolding of karma and if the world is only a place where we repay our karmic debts (both good and bad) what should be aspiration or aim of any individual?
What is the role of free will in the life of a human being? What is the boundary line between destiny and free will? What is the extent to which one’s karma can be changed by faith, prayer and good deeds?
These concepts are very much beyond the apprehension of the average human mind. We have no solid and concrete answers to such questions. So how is one expected to lead a living?
The Gita emphasizes on the fact “Maam Ekamam Saranam vraja”.The literal translation of this is “I alone protect all those who have surrendered unto me”. What does surrender really mean and what is it in the life of an abhyasi?
By Surrender, it means we are surrendering our past, present and future to the Lord or the Guru.

Surrender does not mean we leave our past to Guru and continue to live life the way we like without mending our actions and still expect our Guru to perform miracles and interfere with our karma and prevent us from danger.
Of course, there is no doubt that the Guru can interfere with our karma, it is only when our love and devotion urges Him to do so. But how can we expect Him to do that when we don’t abide by His teachings, which is for our good.
The true meaning of surrender is - We leave our past in the feet of our Guru and more importantly live the present in the way we are expected to live, without adding on to our layer of grossness; inorder to achieve in our future the Goal of human life – Oneness with the Lord.