That means you die.
If you die before you were able to go back in time and kill yourself, you never get the chance to go back in time and kill yourself, and as such, you are alive.
Would that mean that nothing you did would hurt your younger self?
[Edited on 04.24.2012 8:55 PM PDT]
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"People assume that time is a strict progression of cause to effect, but [i]actually[/i] from a non-linear, non-subjective viewpoint - it's more like a big ball of wibbly wobbly... time-y wimey... [i]stuff."[/i] [Edited on 04.25.2012 7:20 AM PDT]