You are assuming that you are capable of doing something wrong.
A perfect voice is still capable of stuttering speech; that does not make it an imperfect voice. Your perfect self is perfect, regardless of how well your form expresses it. You ask the question because there is conflict between the inner recognition of that perfection and your judgement of its expression. Sit for fifteen minutes every morning and search your soul (not your behavior) for imperfection, then let go of the care for the rest of the day. Do this for forty days. If you find imperfection, write back immediately and tell us what you found. Otherwise write back in 40 days and tell us what you found.