Existing everywhere in the universe

The key here is Relativity. These results pertain to external frames of reference. To outside observers, you would have thinned in the direction of travel - yes,to a point a c, To external observers, you time would slow, at c stop. Also, your mass at c would reach infinity, as assessed from outside the moving frame, Within the frame, your time seems to progress normally to you, Your dimensions seem unaltered, It is the exterior of the frame that appears to alter. This is a function of balancing the equation From within the frame, everything outside of it appears to contract, external time accelerated, etc. You are moving through time, as a function of space-time. The more speed you "use" (faster you travel) the slower (contracted) time ticks, At c, you stop moving "through" time, as observed from an external frame. Beyond c you would start moving into the past, again, as seen from the external frame. This is all theoretical, in that you can't move at light speed, since it would take infinite energy to move your infinite mass. At this point, you are just doing math, and balancing equations. You are not in both frames, so you do not experience both frames referents. .

I think it would actually just become flat because length contraction only occurs in the direction of travel. I also found this really interesting. It means that even though in our frame light reaching us from the stars is billions of years old, in the frame of the photon it was only just emitted and traveled zero distance to get to you. Which I suppose means that a photon could never spontaneously decay because it doesn't age...?

Also, another thing that is sort of cool is that tachyons (theoretical particles that move faster than the speed of light) must have an imaginary rest mass and an imaginary rest length (by the length contraction formula). And you don't even want to know what an imaginary length means physically :| Ha ha, also tachyons would have a lower limit on their speed rather than an upper limit. Meaning the slowest speed they could go would be to approach c from above!