If you find that you only have romantic feelings for the opposite gender, but sexual feelings for both genders, then you may be heteroromantic and bisexual.
Perhaps you have sexual fantasies involving both men and women, or you find yourself having sexual thoughts about attractive members of both sexes. However, you maybe you only get actual crushes on the opposite sex, or only find yourself wanting to date or be in relationships with the opposite sex. In this case, you may be heteroromantic and bisexual.
You can still identify as bisexual for the sake of simplicity if that is the identity you are comfortable with. Remember, you can be more attracted to one sex or the other and still be bi, or be attracted to different genders in different ways and still be bi.
You can even be attracted to people who identify outside the gender binary, or people who identify as something other than male or female, and still identify as bisexual.
If you are attracted to different genders, you are very likely bisexual. Romantic orientation can sometimes differ from sexual orientation, so it is possible to be heteroromantic and bisexual, or biromantic and heterosexual or homosexual, or any other combination. While it isn't as common as having sexual and romantic orientations that agree with each other, many people have different sexual and romantic orientations.