Becoming A Writer

My husband wants me to write a book. He asked me a couple weeks ago if I was just going to waste my talent (he's biased though). He asked me last night to write some lyrics for his music for him. I've always wanted to write a book (don't think I could write song lyrics though). I've even started a few books at one time or another but never finished it. I still have ideas for books that I'd like to write but the insecurity of thinking I am not good enough always stops me in my tracks. I want to write children's books and horror novels. I've had poetry published and have written many articles but that great novel is still wanting to come out. I wonder if it will one day.