Hmm ... might be. Cou you give me an update?
Situation: I am bored of Life, therefor I decide to travel back in Time to kill my Parents, so I won't be alive now (which is the future for Time X to which I went back).
But if I am not alive now, how would I then be able to travel back to kill my Parents?
By changing the Past, I open a totally different timeline/reality - that's why I said it's not possible within one Universe. If there are parallel Universes that share the same space it might be possible.