Time travel really real ?

no way to know, according to relativity nothing can exceed the speed of light, but there are theories if you were somehow able to cheat the system somehow and go faster than the speed of light you would be able to travel back in time. I suppose the amount of time you are traveling above the speed of light would determine how far back you would go. However there is no way to speed up time so theoretically you would be stuck in the past unless some crazy portal stuff is figured out.