hey there!
You said in your post that you wished that your life was not predestined. And then you went on saying if God was All Knowing and the Creator then why didn't he just make us all know him from the beginning.
The reason for that is free will. God gives you the oppurtunity to have eternal life with him. It is up to us to either refuse his gift or take his gift. God loves us enough that he sent Jesus to die for us now you can accept this or not.
I pray that this helped you at least a little bit. God bless
And if you have any more questions fill free to ask.