I've tried it and it doesn't work.
Sorry.
In all serious (hehehahaha!), I want to say that this a false dilemma, or at least an situation that flies in the face of logic, and I'm mad as hell at myself because I remember listening to a audiobook written by some genius scientist that dealt with all sorts of physical/cosmological awesomeness, and it explained the concept of space-time and talked about time as the fourth dimension, and there was a part that addressed time travel. And I can't remember what the conclusion was. The grandfather paradox is more philosophically logical than scientifically evidenced but it casts serious doubt over the possibility of backward time travel. In fact, it probably confirms that it's impossible. If you go back in time, kill your grandfather, and then return to the "present," do you find the world as it would be if you had never been born? Sup, impossible situation and consequent mind screw.
As for forward time travel, it is possible—100% possible, and we know with 100% certainty. Killing your future self messes with my mind, though. I want to say it would become a cycle, as the self you'd be killing would be the same self who traveled forward to kill himself, but I don't know jack about this stuff. HOWEVA, given that you can't travel back in time, it would be impossible for you to return to the present (2011), as the present is the past of the future. unless I'm missing something, this means that if you travel to the future then there will be no future self to meet—you are your future self, so to speak.