Worried about my relationship with family

Okay. I'm new here but I've been lurking around and reading a lot of the threads around here and I feel this is the best place to ask for advice and support for things of this nature.

Basically I text my friends with a lot of trust and I've told them about my sexual orientation. Now I think I'm bisexual and I've let friends know about this but being a virgin can put doubts in my mind which is why I list myself as Bi-curious. Anyway, through a series of frustrating, rude, and over all stupid events, my mother became aware of my supposed sexual orientation by going through my phone and reading the texts I've sent. She then went about telling my father who is now "worried about me". He and my mom are fairly religious people but what urks me is that my father's dislike of the LGBT community stems from a lack of knowledge, assumptions, and a stubborn attitude towards it. He thinks it's genetic and he's talked about how "his side of the family has never had a gay" but my mother's side has. I've told him that I'm bi-curious but he's told me "not to make up terms" and he's very difficult to convince when it comes to this sort of stuff. He's very stubborn and he won't support or respect my decision. He thinks by being gay or bisexual or "having sex with a man" will lead me to a tough, harsh life that will end with me dying from a terrible disease from being gay. I'm fine with staying in the closet about my sexual orientation. I don't feel it's my business to share it or anyone else's business to know unless I want to. What I'm worried about is that my father will share it with my Grandmother (his mom) and aunt and uncle. I really love my aunt and grandma but they are extremely catholic and show obvious dislike for the LGBT community. I don't want my father to ruin my relationship with them by telling them about my orientation nor do I want to tell them myself for fear of their reaction. I'm stuck as to what I should do and I feel like I'm not in control of what people know about me, simply because my mom did something that I won't forgive her for any time soon.

Advice, support, or any other word would be greatly appreciated. Thanks for reading.

 

Thank you both for replying. I'll try my best to follow the advice and that site you've linked has given me hope that he'll be a bit more understanding. Thanks a bunch.

 

I have been considering doing the email or letter approach but I want to do it after I'm out of my dad's house. I don't know how he'll react with how illogical he can be so I don't want to be stuck in a house that doesn't like me for four years. I really appreciate all the advice I'm getting. Thank you all so much. When is the best time to send an email or letter to a parent like that? I'm seventeen so I'm not so sure it should be now.