Is it normal that i am a straight guy but want to be a girl?

I am a man and I have an amazing gf whom I love very much. She considers me to be very handsome and I will not lie that I at best see myself as about average or just a little bit above average. However for a long time before meeting her I've contemplated how life seems to be much easier as a beautiful woman who is also smart, family matters and pressure notwithstanding.
As I am quite perverted and kinky as a guy I've more often than what would count as normal imagined myself being slutty or just very naughty if I was a hot girl. I would use my charms just to have sex, and the rest would just be a nice bonus (money, gifts, etc). It was all a stupid fantasy of the simple man's ideas of "the perfect woman".
However, as time passed, despite being in what I would say is the most amazing and perfect relationship I could have dreamed of, I now wish that I was a beautiful woman who could charm any guy into having sex with me. As a guy I should know that we're easy to seduce, in most cases at least. I know I am definitely not right in my head anymore but with enough time I might stop having those desires.

This is both a confession and a question regarding my sanity. I honestly believe that all I'd do as a woman would be to chase after dicks and be a cumslut or something and it's somehow both a real turn on and horrifying that I have such desires.

P.S: No I'm not gay, don't want to be a tranny and certainly don't want to perform sex change surgery and whatnot. It's more that I wish I was born as a beautiful woman. But, I am certain I am only into women, and firmly rejecting any advances from guys who even try to get intimate with me.