I agree with you that therapy cant change your orientation, and I'm sorry you're wanting to change it so badly. Just a few more thoughts for you to consider... could it be where you live? could it be you just haven't met the right people yet? are you reacting to a religious thing?

Where I live gays and straights get along quite nicely. I'm straight and I've always had close friends who were gay, and who by the way break every gay stereotype there is. Actually I have more gay friends than straight.

IMO, there is nothing wrong with being gay except parts of society are homophobic. Parts of society are also sexist and racist, and some hate one group or another for no apparent reason. But you probably know deep down like I do, there's nothing inherently wrong with being gay. A good fraction of society is gay, always will be, same with other species of animals even. Maybe a therapist could help you to accept yourself more?