Nehi, Nephi, Mosiah, Alma, Helaman, Mormon, Moroni, Ether, and many other characters from the Book of Mormon are not mentioned in the Bible. In fact, there is a lot in the Book of Mormon that isn’t mentioned in the Bible and often things in the Book of Mormon contradict the Bible — for more on this, see ‘Does the Book of Mormon contradict the Bible?‘.
Sorry, your faith is how you live, and if you believe in Jesus with all your heart and soul and mind and strength then we are for each other and if youearnestly try to share the Truth to the world then may God bless you graciously!