No. That's not how it works. I disagree that it's a choice. Oh, for me, I can choose between men and women, but that's because I'm pansexual, and my heart beats for whomever I find attractive. That isn't true for someone who is homosexual or heterosexual. Still, if you feel that you, personally, can choose between men and women, and find both attractive, then you may be bisexual.