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That's all right. Basically, if you love both girls and boys, you're bisexual. If a boy only likes other boys, he's gay, and if a girl only likes other girls, she's a lesbian. And if you like only the opposite sex, you're straight. You don't need to be straight - if you love someone, you should just love them and enjoy it. George says he's gender blind, so he doesn't see "boys" and "girls" - he just sees "people." I'm straight, but I wouldn't be upset if I fell in love with a girl someday, even though I don't think I will. A lot of people experiment with it, too.
People like Isabella are called transgendered. I don't really know much about it, but it seems sad and uncomfortable. Really, basically it all comes down to this: Do whatever you feel like. If you feel like dressing like a woman or kissing boys even though you're a boy, then just do it. Dress however you want and love whomever you want. It doesn't matter if someone tells you No. You've just gotta be yourself and do what makes you happy, and you'll never go wrong that way.