The concept of a sexual orientation being "true" is honestly stupid. Sexual attraction isn't absolute, it's fluid. There isn't anyone who is 100% completely straight or gay either. Maybe 99,99%, but not completely.
Ever heard of the Kinsey scale? If you feel attraction to both sexes to some degree, you can consider yourself bisexual. It doesn't have to be 50/50.
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That's not true bisexuality, though. At least, not by my defintiion. I think everyone, on some level, is bisexual. If you're straight and can recognize whey make another person of the same sex is attractive, I'd consider you 5% gay. Does that really mean that that person is straight?
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Sexuality exists on a spectrum. It doesn't snap between 'on' and 'off', between one and the other. The orientations are just labels, there's no "true version" of them. They are just words chosen to generally describe the sexual attraction people feel, for simplicity's sake. Otherwise we would have thousands of separate words just to describe what we now call "heterosexuality".