(I wanted to say this to my childhood friend who got a sex change, but I broke contact with him since he never replied to my message and went along with the procedure.)
You're living a fantasy.
First you must accept who you are. If you say that you were supposed to be a woman then you are saying that God made a mistake, but God doesn't make mistakes. God made you a man.
He accepts you as you are. That means that no matter how big the sin, He will forgive. No sin is too big for Him to cover. Go to him with a contrite spirit and turn away from listening to your emotions. Scripture says, “The heart is deceitful. Who can understand it?” God understands it because He made it. And now He has let you turn to your wickedness because you have abandoned His word and chosen to ignore it for your happiness. Joy is God's gift to us. We cannot obtain it on our own efforts. When you do that, it's superficial.