Good thing I don't believe in Heaven or Hell, because being bisexual would probably earn me a place in the Eternal Fires as well :cool:
Don't believe people who say that; if there really is any kind of God (which I doubt, but hey, that's personal of course), well, I've always been told that God is kind and forgiving, wouldn't he forgive you for being a lesbian as well then? After all, it's not a sin, it's not something you become on purpose, you just are and there's nothing you can do about it.
And never believe people if they call you whatever-cruel-thing for a stupid reason such as sexual preference. There's nothing bad or shameful or otherwise negative about being a lesbian; most women are beautiful creatures, so it's not surprising you're attracted to them.
People should just stop bringing others down for whatever stupid reason they make up. (Unfortunately, though, saying that here won't really help much to stop the worldwide bullying, but well.)
Just be proud of who you are and let them talk about stupid things; if they're too small-minded to see that there's nothing wrong with gay-/bisexuality and have to bring people down for various reasons in order to keep their own ego up, they're just pathetic and pitiful.
Be proud that you haven't lowered yourself to that level and never change yourself in anyway just for them.