There are atleast 6 zodiac signs, where the actual people in them act NOTHING like the way astrology says they want them to. Sagittarius is one of them. Also every Scorpio female, Capricorn female, Leo, Libra female, and Taurus male, in person and in real life, act nothing like astrology has made up to describe them.
Sagittarius are a lot more boring and reserved than their zodiac sign describes. I have only seen some Sagittarius females with an aggressive, blunt, outspoken, extroverted personality. It's usually black Sagittarius females who are the loud outspoken type of black female, and fewer white females who are maybe like miley cyrus. I haven't personally, in real life, met any white sagittarius females who act like her though. They are all pretty mellow and normal acting. And I have yet to ever meet a sagittarius male with an aggressive blunt outspoken personality. They have always been really mellow and more on the serious side.