You know how people used to believe that the world is flat with a beginning and end - afraid they could fall off the end portion?

Later on they discovered that the earth is a sphere without a beginning or an end. Maybe time is a spherical dimension that does not have a beginning nor an end.

If we want to go back to who created us, then we'll have to ultimately think who created the aliens??
Maybe the aliens who created us, were created by another specy of aliens and those by another. Ultimately you will reach a point when the ultimate final creator could be found. That would be god. But then who created the god??? Doesn't he have to be created too?? If not then we have to make an assumption that normal attributes and laws does not apply to God who is timeless. If you think about it, the only timeless thing is time itself because it has no beginning and no end. It goes on forever.