Jesus in the old testament

I am personally convinced that I have found Jesus in the Old testament, before he was born of Marry. In the book of Genisis there are a few occasions that people met a man that was later to be recognized as God, it what they saw was indeed a man this prove's that before Marry was born Jesus was. 

Read Genesis 18

http://www.gnpcb.org/esv/search/?q=Genesis+18

Three men came to Abraham, one was refered to as Lord, this means that it was God. He was in the form of a human, so we see God in the form of a human, and Abraham talked with him. There was no bowing down of his head on the ground, it was as if a friend of Abraham had come to visit him. 

Also Read Genesis 16:7-14 

http://www.biblegateway.com/passage/?search=genesis%2016;&version=31;

Who she origonally recognised as an Angel she later recognised to be the Lord(God)

Genesis 32:22-32

http://www.biblegateway.com/passage/?search=genesis%2032;&version=31;

Jacob wrestles with God, It is very clear here of God in a form like a human. I believe this is the pre-incarnate of Jesus.