Answer:
Our Sun is an average star, or perhaps just a little larger than average. The problem is that we cannot see all the tiny way-below-average stars, and not knowing how many tiny stars there are means that our estimate of what "average" is may be skewed.
For example, the nearest star to our Sun is the red dwarf Proxima Centauri, at 4.2 light years distance. Even though it is the closest star, Proxima Centauri is too small and dim to be seen without a telescope!