Young lady, your mother and your grandmother were not the product of parthenogenesis. They and all your maternal ancestors performed heterosexually and successfully. You are living proof they did. To say that ten or twenty percent of humanity is doomed to heterosexual disfunction is nonsense. Dangerous and arrant nonsense.
Authorities agree that sexual behavior is learned behavior.
We learn our sexual preferences and orientations. No reputable scientist has found any hereditary tie to homosexuality. The problem is that for many years our society has been conditioning more and more people for this kind of behavior. Sympathetic portrayal is the rule now in movies and dramatic television. I believe it could be demonstrated statistically that in the last ten years major network television productions have portrayed sympathetically fewer clergy than homosexuals.