Is There a Centre to the Universe?

Scientists tell us that the universe is expanding and has been expanding ever since the big bang, 13 point seven billion years ago. But it turns out the universe is not expanding in that way. Space is more like dots painted on the surface of a balloon which is being blown up. It is like raisins in a loaf of bread dough that is expanding as it is rising, and as it is baking. Every point in the universe is expansion equally apart from all other points, which mean s there is no centre. So you could say the universe is like a circle without a centre, or a circumference, which is, of course, no circle at all.