I can't say that I know God, because who can truly know how a God feels and thinks? However, it's always seemed to me that He's all about love. Love for others, love for nature, and, what's sometimes the most difficult - love for ourselves as well.
You are bi. That's simply the way you are, just as some are attracted to members of the opposite gender, and others are attracted to members of the same gender. That's nothing to feel guilty about. Feeling guilty about something we have no choice in is like feeling guilty for the colour of our skin, or the colour of our eyes. It doesn't make sense.
Now, some would say that it's acting on your attraction that is the sin, and that it is a test. That doesn't make sense either, though. Sooner or later you might fall in love, and it might be with someone of the same gender to you. Why would a loving God tell us to deny love? And why would an all-powerful, all-knowing, all-loving God care so much about what we do with our bits and pieces?
Some religious advice when it comes to sex is good, and makes sense. Adultery can do a lot of damage, both physically (risk of STDs that you can pass on to your partner) and emotionally. Not having sex before marriage made sense in those times of no contraception, because again, you could pick up STDs or make someone pregnant. These days it isn't such an issue so long as you use protection and, if you sleep around, you need to protect yourself emotionally as well, as some can deal with it and some can't. It's all about being sensible, really, and respectful of others. But don't let it weigh you down and make you fearful of eternal punishment.
I think of it like this - if God knows you, and loves you, would He then allow you to suffer eternally for being who you are, and for (eventually) seeking love? It feels really wrong when parents reject their children because they are gay, or bi, because they should love their kids the way they are, and should want them to find happiness. How much more wrong, then, would it be for God to reject you for the same thing? To think of God in that way is to basically call Him a cruel, uncaring entity, and as far as I see it, that's not what He is.