Choices & Destiny

never seen two things so interwined into each other....
yesterday i was thinking...wat is it actually? our choices shape our destiny or the destiny decides our choices.
I was thinking about my own life...contemplating on the things my friends have experienced..and was really stumped. Whatever you say be it the choices you make in life or the experiences you go through one can never decipher the real reason behind that.
it is like throwing things in the void..waiting for something that might never return.