Verified answer

correction: was, not vas.

''You are that which I wish not to be.''

It's a bit poetic.

It's:

Du bist das, was ich nicht sein will. = You are what I do not want to be.

Hey and it's what they said. Here's a good translator I found

http://translate.reference.com/

You are what I do not want to be

You are not what I want to be.