Do not restrict yourself to a group or select shanties & forebitters because of your voice. It's more how you sing them. It's not weither your singing with a "contralto female voice" or a "boy in base", if you've got a voice sing any & all that you'd like. Listen to some of the recordings from the West Indies, Bahamas & others of the black seaman's culture & you'll find many examples of your voice. The high voice is what would travel in a storm & be heard so don't go thinking that because you have a female voice that you need to only sing shanties that'll fit it. You fit the shanties to your voice, make them yours.
Happy Singing
Barry