All activities and events that a body is to go through are determined at the time of conception.
Mind is consciousness which has put on limitations. You are originally unlimited and perfect. Later you take on limitations and become the mind.
The thing to do is to concentrate on the seer and not on the seen, not on the objects, but on the Light which reveals them.
If a man considers that he is born, he cannot avoid the fear of death. Let him find out if he has been born or if the Self has any birth. He will discover that the Self always exists, that the body that is born resolves itself into thought and that the emergence of thought is the root of all mischief. Find from where thoughts emerge. Then you will be able to abide in the ever-present inmost Self and be free from the idea of birth or the fear of death.
Surrender is to give oneself up to the original cause of one's being.
Happiness is your nature. It is not wrong to desire it. What is wrong is seeking it outside when it is inside.