How to prove you don't exist in Seven easy steps!
Step 1: You exist according to your senses.
Step 2: Your sense have been proven liars.
Step 3: You cannot trust your senses to tell you the truth.
Step 4: Your family and friends' senses can't be trusted either.
Step 5: There is not proof you exist that can't be refuted.
Step 6: Therefor you don't.
Step 7: Vanish in puff of logic. (If this step does not occur, you obviously didn't do the preceeding six steps right. Keep trying.)