For those who beleive in horoscopes, how do you explain those who don't fit their signs?

I never fit my sign and began searching for the reasons why , but I fit the description of the mixture of everything together . I am a little part of my sun sign , the sign of the cusp I was born on , my moon & ascending (the same sign) , and the rest . I think that you'd have to be fighting it pretty hard to try to not fit 90% of your chart .