I have someone I know who's like that. He was abused sexually by a neighbor, moved away, came out as gay-but-maybe-bi, but still identifies (last I checked) as a Conservative, Christian, and still wants a family.
My best thought, right now, is to stop trying to find arousal with girls in the same way you(r brain) do with guys and flip the paradigm in your head about how you approach it. Start looking for what you *do* find appealing about women/females. If there isn't a massive repulsion, severe cognitive disonnance, or some other internal conflict of values that you would push through, allow yourself to accept it as is and let it grow.
Attraction, in the biological sense, may not be a choice, but you can choose what you want to feed in yourself and what direction you want to go with it.
Also, the church thing can help, mainly because of helping to foster a spiritual connection and possibly a supportive community.
Best of luck to you.