Well unless its all skewed all over the place like a whirlwind hit everything and its just scattered all around I see no issues of having to "hide" all the girl clothes, nail polish, etc...
Unless you have your clothes scattered as such or have a fashion sense of having manikins dressed as per your next outfit for the next day, if it is all in respective closed drawers that should be well out of sight. If you need more privacy to your clothes consider a closed hamper or translucent or opaque laundry bag for dirty linens and clothes. On the note for the nail polish and other make up if you have that, should be in closed drawers either in your room, or wherever you may have it tucked away for it to be out of sight per se. I'd suggest that if you have a linens closet, do not stick it in there as while you have guests, that would be an open as you grab towels for showers thing, I would suggest a drawer that would be in your room to stash that away, as being neat and organized. And as for the sheets/linens/blankets, everyone has their own preferences of colors and what to have on their bed. If they say anything questioning pink sheets and flowery blankets, just say you liked the pattern.
Heck, while I was in Army advanced job training for six months, there was one guy, straight as a 2 by 4, who decided to dress his bed in pink sheets and strawberry shortcake blankets with cupcake pillows.
Just be honest and not try and hide it, unless you still need time to figure things out before saying anything. Good luck and I hope things would turn out well.
Kate <3