I can't tell if I'm a lesbian, straight, or bi. How can you find out who you truly are?
Give it time, go with what feels right for you. Don't be worried about the labels, about trying to fit one exactly, everyone is different and human sexuality is a very broad spectrum, you'll figure out how you feel with time.
Like Davii said, just do what comes naturally. If you find yourself attracted and connected to someone, does it really matter what gender they are? A special person is special no matter what equipment they have. I know it sounds cliché but follow your heart :)