what is up with pisces and aquarius?

i was born on the 19th of february and i am always confused as to which sign i am. in some books and sites i am pisces and others i am aquarius. help! which one am i supposed to read? my birthday is right on the edge of when it changes from aquarius and pisces.

You were born on the Aquarius-Pisces cusp.

i read somewhere that when that happens your surposed to pick the one you resemble the most.