Never had a sexual fantasy of my own.

I have never had a sexual fantasy of my own. I have had lots of sex, but never once have I developed a sexual fantasy. All the girls that I have been with have gave me ideas, or told me theirs and ask me to try it, but I never really end up liking their fantasies. I feel as that I am missing out, and I have been becoming a little board with sex lately, and yes, I am a male. Plus, I never have sex in my dreams. There have been many times when I would get close to doing it in my dream, but something always happens. Is this normal? Also, where can I develop a healthy sexual fantasy, and have sex dreams? Thank you, Please, leave comments.