There are so many people in the world, but the constellation is only 12. Then there are not many people who are the same, but this is not the case. Why?

As far as I know. Yes, there is only 12 constellation, that is to say, if you believe in the constellation, you should know that each of us has our own zodiac sign, and everyone has different living environment and background, different blood types, different education levels and many other internal or external factors that you know or don't know, so even people with the same personality are different, which is not difficult to understand. But the general outline of a constellation should have a stereotype, so we don't have to get too entangled in it, do you think?