I think you would have more success finding homosexuals who believe homosexuality to be out of alignment with God’s will for man.
Mentally ill people, regardless of their illness, rarely believe they are the ones that are ill.
Some homosexuals are mentally ill, as are some heterosexuals. The question of mental illness, however, is a sideshow and distraction from the certainty that all homosexuals (indeed, all LBGT, etc.) are pridefully, assertively, actively, and resolutely rebelling against God and His will, which He has clearly revealed biologically, socially, and scripturally.