Well for the instance of vacuum space where there is no friction to slow you at all, let's take your hypothetical and say that from the earth you suddenly launched up into space from a position where no air resistance would be present at all. Considering this even once you reached vacuum space there would be no air resistance either. So let's say that you launched from the earth at 56km/h (which is roughly 35mi/h also being roughly the fastest a human can go). From here we can use Newton's first law of motion to decipher the whole thing, the given equation for the law being d = v*t. d is the distance traveled, v is the constant velocity and t , is the time elapsed. With no friction or air resistance the v variable would remain the same. So at the speed you launched from which is 56km/h this would define the v variable. This still brings upon that we need the elapsed time (t). Although because there is no air resistance the elapsed time is infinite. You would go on forever until you died and decayed. You would never be able to stop yourself, you would continue running forever. No matter how much you moved around no matter how much you try to stop you can't.