Why do constellations affect personality?

I am a Libra, and I find that most Libra's characteristics are in line with me. I can't tell whether I am catering to the characteristics of the constellation or the constellation has influenced me. Because the constellation culture has become very popular, it has an impact on the character of people who believe in it. But I don't think it's too much to say it's a psychological hint. When people are told that their personality "should" belong to a certain template, they may form a psychological hint and move closer to that template in their future life. Over time, what is not like is like. This may be the only way that constellations affect personality. The simple understanding is that, for example, if a group of Capricorn people describe them according to Gemini's personality characteristics without knowing their horoscopes in advance, there will not be much difference between judging whether they are allowed or not and telling them the correct horoscopes.