What exactly does that mean? I cannot travel to proxima centauri. Does that mean it is not in my universe?(If I cannot travel to something, I cannot travel to that something in any fashion)
Why can't you travel to proxima centauri, other than the fact that you haven't invented a convenient method of travel? If we sent you in the right direction in a Soyuz capsule, you--or at least your remains--would get there eventually, provided that you had enough energy to escape from the solar system at all.
We'd have to give you a much harder push to catch up with the distant quasars, because they are rushing away from us so fast, but in principle it's possible, let it be ever so hard in practice. No physics principle prevents you from going as close to the speed of light as you like. It may take you a gigantically large time to close the gap, and your practical window may already have closed (the universe may end in some fashion before you get there, so you should have started a very long time ago), but that's tough darts. I said "geometrically", not "practically".
(No more lawyering, now.)