Hmm, nn, that sounds a little defeatist. Isn't the point of philosophy to seek answers?
That aside, here's the way it goes. Our planet is the the third planet form the sun and the second last of the small 'rocky' planets. After Mars comes the gas giants. Our sun is a smallish yellow star roughly three quarters of the way out on an arm of a spiral galaxy, a galaxy being a large group of stars, 'spiral' means that when you look at it from the side it's sort of flat and it's spinning, kind of like a big frisbee (with arms

).
It's not even a very big galaxy. In fact when you take a look at the other galaxies on the neighbourhood, we look down right puny. The 'universe' is everything. Everything. (think 'uni', like unicycle, or United States, it mean one). It's not just everything we know or everything we can see. It's
everything. All. Which means it has no end. Because anything more would still be part of 'everything'.
As for the 'near/far' thing. I think we have a miscommunication. Yes, when you have infinite space, it doesn't seem to make sense to say that something is 'near'. Near compared to what? The answer is 'near compared to anything else'. (remember, everything is relative)
It's the same as saying that there is no such thing as fast or slow. After all, when you think about it, everything is moving. But if your just whizzing through limitless empty space, it's just the same as staying still because you aren't actually getting anywhere. So introduce another point of reference.
Now you might think that If something just popped into existence while you were whizzing along that it would immediately prove that you were moving all along. Nope. Cause maybe it's actually the other thing that's moving in he opposite direction. And of course it is, since there's no other point of reference.
Same with the near/far thing. OK, so to us it seems that Pluto is far away. But compare that to how far away the next galaxy is and all of a sudden Pluto seems right next door. So near and far are relative terms. They're relative to the scale of what your talking about. They are not however useless. Nearer and Further are even more useful. Because it doesn't matter what the scale. Pluto will always be nearer than the next galaxy and Mars will always be nearer to us than either.
As for "where is the universe". Yup, it's everywhere and everything.