You don’t choose to become a gay, straight or lesbian. It’s something that you are born with and cannot suppress it for too long unless you are living in a really oppressive and closed society.
You may call it ‘unnatural’ on the conventional grounds that homosexuality doesn’t serve as reproduction or procreation but it is ultimately up to the individual who decides and determines the purpose of his sexuality and not society. The world’s population, in initial epochs, wouldn’t have probably soared if there was not an immense pleasure in sex.
Whether you attribute homosexuality to certain conditions and environmental factors during the tender period of upbringing or pregnancy or, it is still ‘inbred’ and instinctual and thus, you cannot blame the person for expressing what he has in in his body. In fact, squelching your instincts is more unnatural. Fortunately or unfortunately, truth and concrete realities often do not conform with our standards of religion, sexuality, or even humanity.
You should rather deal with it and not pretend to be someone you are not.
Initially, I hated myself and wanted to behave ‘normally’ but it took me years of extreme pain to ultimately admit and succumb to what i am. There was no logical reason to resist it physically while my whole existence was tenacious to express it. No ideology or religion convinced me and provided me with a balanced reason.