I am male 17.

I had a dream where I was naked and I was female. I was walking around this mansion. I found a mirror lying on the floor in a room on the second floor. I put my leg through the mirror (like a portal) and my one leg went somewhere else. And then I woke up with a mess... I'm emberrased. But I want to know if this is normal. I like women and have a girlfriend, so why am I dreaming I am a girl? Thanks!