A world where you are?

A world where you are? Somewhere in this world is connected to the. Be sure not to make any place to meet somebody. It's just the past but the future is still unchanged. If you can go and where you would have to do to please you? Have seen the future? Change the past? I want to change? How can achieve all that? All I want to stay where you would have. What is this world? What is this place? What is time? Will you teach me?