Oh, hun, big hugs to you!
I'm sorry that it seems to be tearing you up inside! Once you find a way to accept it yourself and become more comfortable... you very likely won't worry at all what other people think. It's all about what YOU think and feel. Your husband is a slightly different story but he needs to understand that it's something that cannot be helped. Sexuality is just another part of you like the colour of your skin. It shouldn't be treated any different in life, but sometimes it unfairly happens anyway. I guess I can't tell by your description if you're interested in working this out with your husband or not, which is probably something that you need to figure out soon, depending on how crazy you are making yourself over this. Would you be fulfilled if you were able to have both at the same time? If so, somehow your husband needs to understand that it is possible to be with/love both at the same time. It doesn't HAVE to be one or the other -- plenty of people make this work. However it's all dependant on how YOU feel and what is ultimately going to make you happy.
Bisexuality is very real. I personally have come to accept that I will never choose, and I don't have to. I can't imagine feeling like I had to, that would make me nuts. I suspect that your experiences with your husband and other people who already had made up their mind about something they don't really know about has invalidated your feelings quite a bit. If you start to believe in yourself, than perhaps those that are close to you will pick it up? I'm sure there are articles out there you could show your husband, or SOMETHING to try and prove to him that it is possible to love both. Even at the same time.
Oh, and your parents -- no wonder this perplexes you! My dad is very conservative, and that's hard enough. I can't imagine adding the whole bible bit into the mix (luckily he's not religious conservative, or else I'd have gone nuts long ago). That must be very invalidating as well. Just remember that it is their opinion
. You have to do what's right for yourself, not
live in another way to make other people happy (even if they don't know about it). Make sense? I hope so.
In any case, you're going to have to figure out what it is you really want and need, and go from there. I wish you all the luck in the world!