Our expert says:
OK, so long as the shower doesn't object ! Maybe get some karaoke discs to sing with at home ( but please don't do it in public !) --- it'll give you support and a guide to the tune, while you sing away. If that keeps you on tune, take a disc player into the bathroom ( with due electrical precautions ) to help you sing better there, too.
It's not a mental disorder, of course, but in some folks, with extreme forms, it's a neurological / brain disorder --- similaer to other varieties in which people struggle to write, or dyslexia, and so on. Dysmusia deserves as much respect.
And I'm sure you're right that lack of exposure to music when young, and lack of experience in early life, could contribute to this. Some things are easier for the brain to learn when one is younger --- for instance, when one learns languages, it's easier when a child, and one usually gets the accent perfect ; when learning as an adult, it is harder work, and we may never sound totally convincing.
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