Actually we don't use personal pronouns much, because the different verb endings tell us if the subject is I, you, We...
I = yo
you = tú
he = él
she = ella
it = ? (we don't have a neutral pronoun. Strange as it may seem, things are considered to be either masculine or femenine
)
we = Nosotros / Nosotras
you = vosotros / vosotras
they = ellos / ellas