Redecorating My Bedroom? I'm a 15 year old girl and I' stuck next to...

I'm a 15 year old girl and I' stuck next to the tiny box bedroom which is very cramped and in attendance is very little space. My mum said I can desire what to do with it myself but I hold no ideas. I love to hotel-boutique sheek style but I also love the country style. I don't want it to be depressing because my room is small enough as it is. I involve ideas on decorate and furniture, my mum suggested a cabin bed-which would be just the thing as it makes space but I expect it would be kinda childish.
So I don't know what to do to make space.
Thanks for adjectives of your help.
Answers:    Getting a futon/convertible sofa will free up seriously of space, you can use it as a couch for when friends hang out and fold it down at darkness for sleeping. Put a small desk in front of a porthole or angled in a corner. Putting up floating shelves will also serve save space to own a place to display figurines, photo's or trophies, accessorize with wall art, candles and plants.
How around a "light warm" sage or blue for the walls and after paint the wall the futon is on a deeper sage/blue or wallpaper with sage or blue contained by it (or the wall your headboard is against if not using a futon) an articulation wall will make your room appear larger also will hanging a big mirror.
Place lamps/sconces to light respectively area, you could make the addition of rope lights for ambiance.
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Ive Just Moved House And Goin To Decorate My Room Too Lol. Im 14 :)
Hmm Well As You Said You Have Quite A Small Room. Maybe 3 Walls Plain White For A More Brighter Bigger Effect And The Other 1 Wall Maybe Vintage Wall Paper Which Is In At The Moment In England For Defo. And Bedwise. I Thought A Cabin Bed Isnt That Childish As Long As You Have A Decent Bed Cover On It Lol :) x