The universe does bend, but unlike a road, the light bends along with it.
If the universe stops where the last stars we see about 13+ billion light years away, then we must be contained in something would you agree, similar to the gravastar theory?
The universe does not have a boundary. If you think in two dimensions, for a moment, it could be akin to the surface of the Earth: there could be a finite amount of space, but you could travel infinitely in any direction, if you wanted to.
I don't think that's the case, I think space is eternity.
Space may or may not be infinite, but in the first place, the amount of "stuff" we can in principle travel to (which is what I mean when I talk about the "universe") is demonstrably finite, and the "stuff" we can see is of finite age. Look out into the universe, and you see that it was a very different place 10 billion years ago.
But anything's possible,
That's just it. Some things are possible, but not just anything. At its core, the universe behaves according to one set of universal laws. Even in the complete absence of theory, our measurements have constrained pretty severely what those laws might be. We don't know nothing.