What 5 dimensional universe? You need to specify what you mean by this.
I think your confusion is arising because you are still in the mind set that spatial dimensions are real and physical, and that temporal dimensions is somehow different. This is the exact opposite of what relativity proposes: relativity puts spatial and temporal dimensions on an equal footing. Space and time are combined into space-time, and a set of four coordinates (t,x,y,z), say, label our position in space-time.