The Bible doesn't condemn "being gay". It condemns specific behaviours: men sleeping with men, women sleeping with women, men acting and dressing as women, and vice versa; as well as thoughts and actions (e.g. fantasizing, viewing pornography) that encourage these appetites.
Some men are born with tremendous wealth but are commanded to not be avaricious. Some men are born with a predisposition to addiction but are commanded to eschew addiction. Some men are born with (or develop in the course of their childhood) a predisposition towards violence, hatred, pedophilia, bestiality, homosexuality, fits of anger, and a litany of other vices and perversions.
There isn't a man on Earth who doesn't struggle with carnal human nature, nor is there a man blessed in every way so as not to struggle with something--indeed many things--on a daily business. Forgiveness, loving one's enemies, self-control, longsuffering, eschewing covetousness, forsaking sin, and resisting all manner of temptation are lifelong battles fought day by day. Nevertheless, God commands man to overcome, to choose good over evil, and He promises true Christians, who love His Law and live by His every Word, the sure power to overcome all things with His help.
To the man with perverse sexual appetites, the charge is no different: Don't act on them, don't feed them, don't dote on them, and, with God's help, overcome them day after day until this sojourn on Earth is over. Merely possessing the appetites (i.e. "being gay") doesn't make one a sinner. Sin is transgression of the Law. Merely possessing carnal appetites is the human condition.