I had a dream once where I met AdinX irl, and he was actually a 17 year old woman.
We became friends and went on a load of water slides, I really have no idea myself.
Okay, I can represent this in a loveual Sigmund Freud way and the other way.
The loveual way:
The fact that you pictured him as a woman tells me that you may have some attraction to him, not necessarily loveual but maybe friendly. This is why you pictured him as a woman instead of a mean, deep down, you may think that get people are bad, so you picture him as a girl. The fact that you both went down water slides means adin was in a bikini, this is pretty self explanatory.
The other way:
You feel that your friendship with adin will be stronger if he was a female, so you picture him as a her. The water slides could represent your love for waterparks and it is your highest form of entertainment, and you want this experience to be memorable.