Why are the characteristics for my astrological sign pretty close to my personality?

I don’t believe in horoscopes, tarot cards, or astrology, but I looked at the personality traits for Scorpio, and I found that for the most part, it was really accurate.
On my “Big Five” personality test, there was also a section about your “true” zodiac sign, and I tested as a “true” scorpio because of some characteristics I answered in the five hundred questions or so.

How is this possible? I don’t think that the stars have anything to do with my birth and personality, but it seems like they might. Can anyone help me figure this out?