Everything is possible. To understand how to do any so called 'supernatural' things you first need to understand the principles of that, and second have faith. Faith means that you're 100% convinced and fully believe that what you're about to do will work before you do it. For example: If you want to use magic you first need to understand how real magic works, not the mumbo jumbo you see on anime, movies, tv-shows, books or anywhere on the internet. You have to understand the real Principles of Magic (which is lost in history and who knows if we'll ever find it from scratch). Second you must have absolute faith that you will do it just before you use magic. The reason this two steps are required is because if you don't understand what you're doing then you can't do it (you're just pretending) and the reason you need faith is because your access to your spirit through faith. You probably have heard mind of matter but it's actually spirit over matter. So that's why you need faith so your spirit can overcome the material world and by your understanding of the principles (for instance magic or in your case it can be principles of time travel, etc.) you can apply your spirit to do those things that you were taught to be impossible. Btw this is a huge secret and the only reason I'm sharing this to the world is because I know no one knows the principles of the spirit or magic or any other supernatural thing which is the first and primary component to use your spiritual force.
