Twisted time

Now think about the time like it was a pool. Think about if you hated yourself enough and time travel was a possability. Now this is very weird of me to think of but..... If your future self went back in time to kill you're past self during the present (your present not your future selfs present) then would you see yourself die twice or would you not exsist to see yourself die? Then if you didn't exsist to see yourself die then how could you kill yourself? In my opinion you would see your past self die and then your present and future self would stop exsisting altogether AFTER you commited the act. This, of course, is my opinion... Why don't you tell me yours?