I've recently been learning about relativity and quantum physics. I understand it quite well now but i have a thought experiment that doesn't make sense. If i travel into the future through a high speed train and see the world blown up by some epic disaster, doesn't this mean that this was destine to happen? Since we can travel back and fourth in the 4th dimension(easily forward, but not so much backwards) does this mean that every thing in the universe is definite and fate is real? Quantum mechanics obviously doesn't allow for this but from my understanding(which could easily be wrong) this is only due to the 5th dimension, not the fourth.