Answer:
I'm the source of all emotion, but I'm caged in a white prison.
What is never used unless it's in a tight place?
I have an eye but cannot see, You'll head inside when you see me.
The moon is my father. The sea is my mother. I have a million brothers. I die when I reach land
What can be seen but never found that only hides in the unwound?
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?