I'm a Gemini?

So recent news says that I'm actually a Gemini and not a Cancer as I'd grown up to believe. Of course, I never believed in any of that stuff, like the stars can really influence our lives. But, I do have the personality traits of a Cancer. That has to be more proof that this stuff is false, right? If I'm actually a Gemini, how could I more closely match the traits from another sign if the stars influenced me when I was born? Plus, my dad is nothing like a Sagittarius. My mom and little sister are sort-of like Aries, but are they really Aries anymore? Hmm...