There are those who mistakenly believe a person's sexual orientation can be changed and try to force them to change it. It can't be.
Everyone's sexual orientation falls somewhere along the continuum of bisexuality. Everyone is capable of enjoying sex with both genders.
This is easier to realize for those of us who are still young. The old people are far less physically attractive and thus are presented with minimal oppurtunity to sexually explore their inherant bisexuality unless they are paying for sex.
For the young and youthful, however, we are in our prime! The peak of our beauty is at hand! Tis far easier for us to find other beautiful people to explore our sexuality with. There are so many options! Why limit yourself to only half of what the world has to offer? By convincing yourself that you are "straight" or "gay" you are blinding yourself to half of your sexual potential!
Embrace your nature fully!
Anyone can alter their sexuality by making conscious choices to pursue sexual encounters with either sex. Enjoyable encounters will alter your preference for the better, unenjoyable encounters will alter your preference of that gender for the worse.
Sexual orientation is a choice, and something that can be altered over time through your decisions, your experiences, your thoughts, and through sheer force of will.