No idea. I quite like lying on the grass when it's a pitch black and clear night and looking at the Milky Way. It's staggering to think that all of the stars we can see with the naked eye are only in "our" galaxy. So those billions of stars are all pretty much on our own doorstep but far too distant to allow travel between them and us. It's even more staggering to think that there are billions of such galaxies further away. If there is life out there we won't be seeing it anytime soon here as the distances are just too huge, even within our own galaxy. But still there are people who are convinced they have seen alien spaceships because "there cannot be any other explanation."
We can't comprehend what is "outside" the edge of the universe (if indeed it has an edge). It's a bit like an earthworm can't comprehend the offside rule. It doesn't mean there necessarily can't be anything "outside" of the universe.
Who knows how far it reaches? We can't possibly tell as we can only detect the observable universe. There might be a limit, there might not. It's healthy, I think, to wonder about these things from time to time. But for me it just shows how precious our short lifetimes are. We're so lucky to be alive - best to make the most of it for ourselves and for others. I think we should cram as much into our lives as we possibly can.