We are able to guess how big the universe is by looking at the furthest stars and seeing how long it takes for the light from those stars to reach us. We have guesstimated it to be 14billion light years or whatever. The number is not important.
From the point of measurement to where we see the furthest we can see, there would be a circumfrence from that point. Wouldn't this mean that we are infact the center of the universe?