Being 1:1 with your frame of reference is actually one of the problems.
Say you’re Barry Allen and you’re running from Los Angeles to New York city. Given the nature of your powers, you arrive there basically instantly as far as anyone else is concerned.
But for you? You experience every single footstep you took along the way. You arrive bored out of your mind and possibly going insane after running across the continental United States in, for you, months of being absolutely alone in a world of utterly still statues and an unmoving sun.