You're contradicting yourself. Is it a choice, or not? Are you saying homosexuals have a choice, but heterosexuals do not? Doesn't that imply that, given a choice, 100% of people choose to become homosexual? Does that make sense? I think not.
Regarding your "99.999%" figure -- I take it you interviewed 100,000 gay people and 99,999 of them told you they made a conscious choice to become gay? Riiiiight. In fact, have you ever talked to a single gay person who told you this?