Why did I have this dream?

So the dream starts with me being shown to gym class in a new school, But I'm a girl now and when I get to class the pe teacher introduced me as A girl named Jaiden and everyone was no wiser that I used to be a boy and after he introduced me I went back to my seat and I was controlling female me, after my pe teacher took attendance I was pulled out by the principal and the principal knew I used to be a boy and he asked me if I was doing good and that I was having no problem with being considered a girl and I said I didn't everyone thinks I've always been a girl and after that this girl named Alexa came to me and said she was gonna give me a tour and this was a relief considering I didn't know were my dorms were(this was a college btw which was weird since I am only in highschool and she showed me around and then she told me to look around while she got my dorm key and I did but I got lost and she found me and led me to my dorm and that was the end and when I woke up which ended stopping it and when I woke up I felt a strange happiness that I've never felt before I felt completely felt like me in the dream