A good friend that I have known since the 6th grade grew up in a very strict Mormon household in a very strict Mormon community. I always knew that he was gay. He did, too. In fealty to his parents and church, he did everything they wanted him to do in order to not be gay. He served on a mission. He went to special camps. He prayed about it. I believed he prayed sincerely and with dedication. He went to BYU. At the age of 25 or so, he decided that either God had made a mistake or that the LDS church was wrong about homosexuality. He left the church at no small cost. I've never seen him happier or healthier. 

Best of luck to young Savannah.