Coming into the light?

I'm 18 yrs old and I'm biual. I've been out for a few years now to everyone but my family. My family is a South Louisiana Cajun family and vey much old fashion. I want to tell them so i don't have to go on hiding any gf's i have and avoid the akward times when she's comes with me to family things and all they do is talk about these guys they want to hook me up with, but at the same time I not and I'm not even sure I should tell them or even how i would go about it.