How to make a girly room masculine?

So I'm a trans guy who ****** himself over by picking the girlest decor ever. I have dark purple walls that I can't paint over, teal curtains and dark brown dressers. Also a small room. I don't know how to make my room look manly without changing the wall color or furniture. I love DIY stuff, plus i'm not very rich so please keep that in mind
And so you can help better, I love minecraft, the color red, superwholock stuff, tumblr, and other things like that.
What are your suggestions?

Put some earth tone color into the room, like tan curtains and matching throw pillows.

Get rid of any accessories like cushions, rugs.

Keep to one colour if you can't change the colour of the walls it will have to be purple and get purple curtains, purple bedding etc

Keep the place tidy tidy tidy with nothing on display.

Don;t have any frills on the bedding etc just plan solid covers

Fabric bulletin pin board to set on the back of your desk for notes, photos, cards…
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Easy and inexpensive to make one by wrapping fabric to the back of a corkboard and staple in place. -cut fabric 3" larger
You can buy 1/2 yard (18x45") of black/red geometric fabric at any fabric store or walmart for $3.
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Print a full page of superwholock pic "right clck" on pic, print picture
Make a picture frame by cutting box cardboard to the size of pic^
To make the hanger, punch two holes 1/2 inch apart, 2" from the top in the center,
thread both ends of a twisty-tie (paper covered wire used to close bread) thru the holes, make a loop,
turn frame over and twist the ends together.
Cut a 2" wide strip of the fabric and wrap frame.
http://tlc.howstuffworks.com/family/fabric-crafts5.htm - overlap like the picture
Glue or paperclip pic to back of frame so it's facing forward.

3-D minecraft collage
Cut a large rectangle from box cardboard or use a poster board.
Make the hanger at the top in the center.
Cut out or print different size minecraft pics, glue pics slightly over the edge of the other-overlapping so you can't see the cardboard underneath, you can add words/captions.
Turn over and weight down til dry to prevent curling.

Paint the woodwork a dark color, black or dark brown, get dark masculine curtains and pick out some masculine bedding and pictures. With all those dark colors you'll need extra lighting, pick bold a chunky things, you can buy lamps at a thrift store for a reasonable price or rummage sales. If you don't pay a lot of the lamps you can paint them a dark color, uplights are also a great way to add light.

Are you the daughter of Mohammed Ali?