Why is bisexuality underrepresented?

While bisexual people exist more than gays or lesbians. I think people refuse to identify as bisexual and refuse to acknowledge their same-sex attraction. Like, for example, "straight" men's attraction toward femboys—liking femboys is really popular these days, but no one likes to acknowledge that they have some attraction toward the same sex? I think people misinterpret their attraction toward femininity as attraction toward women or vice versa, with straight women. I really do believe that people in the world are mostly bisexual, and they just don't know it.