Paul calls these affections "vile affections" and that's not as a compliment. What you call "being homosexual" Pauls calls being given up by God unto vile affections.
I understand your point re Romans 1:26, but in that same verse Paul specifically says, "changed the natural use, i.e., the act, and in 1:27 he refers to the unnatural lust.
And that is my point. The act, and lust connected with homosexuality, is clearly condemned.
But just as heterosexual men have a natural urge to get together with receptive women, the act of adultery, and the lust of fantasizing, are condemned. Being heterosexual is not condemned. Acting improperly is.