I am an American woman and I embraced Islam five years ago without publicly announcing it. Am I still a Muslim?
You were a real Muslim all this time and your faith is true and intact. Publicly announcing your faith is not one of the conditions for embracing Islam. The Quran tells us that the believer from the Pharoas was concealing his faith for a period of time. Also Negus embraced Islam without telling his people about it and the Prophet (peace be upon him) prayed the Absent prayer when he was informed about his death.