Growing up, I was homeschooled and I hardly knew anything about LGBT issues. I had heard that gays were weird people who chose to be that way, mostly lived in California, and were out to destroy the church and the traditional family and convince children to be gay. That's pretty much all I knew. I didn't even know bisexuality existed, so I thought for sure I was straight because 1) I hadn't deliberately decided to be gay, and 2) I knew I was attracted to women. Anything else I just attributed to innocent curiosity.
I didn't realize I was bisexual until my freshman year at Cedarville, when I started to have close friends of both sexes for the first time. It took a while, but eventually I couldn't keep denying it any more. It also helped that I learned one of my closest friends was LGBT, which did a lot to undo all the weird stereotypes I had of the community. Realizing I was attracted to men wasn't a traumatic experience, even though I was still very Christian at the time, because I wasn't in love with any one man in particular and as a bisexual I still had the option to marry a woman and not sin.
I never came to the conclusion that the Bible allowed same-sex relationships, although now that I'm not a Christian any more I don't care one way or the other. But I think it's important for people to understand that reasonable, truthful people can look at this issue from a Christian perspective and come to different conclusions.