Prevent myself from being gay*BACK TO THE FUTURE*?

I was thinking lately. After watching back to the future it hit me. What if I invented a time traveling delorean. Install the flux capacitor and generate the 1.21 giga wats of electricity. Sending me back to the year 1992(born in 93). I can go back to that point and "pull a Mart McFly" meaning do something to alter the space time continuum. I think its possible. I mean Einstein did offer the theory of relativity and the theory of alternate dimensions. I think gay is gross so why not go back in time or something. Maybe I could also go to the year 2025 and see if I marry a fine women. I can prevent this by going back and time and get my parents to have different chemicals in them before they make me. But I will make sure I am still born. Nothing will change, I will go back to the future in the year 2011 and everything will be normal except my sexual orientation. I mean how can me altering my gay gene change or have a major impact on my timeline?