Buy one of those fire escape ladders that store in a box under your window. If you really need to sneak out that would work well.
I suggest no lamp on stands. Either a floor lamp that will bend to give you reading in bed or one of the ones that hang from the ceiling. Your surface space will be limited so use it wisely. Even a wall mounted one would work.
Tear the book shelf apart and use it as hanging shelves for the books up close to the ceiling. That area is wasted space anyway. Use some interesting natural rocks for bookends, if needed. You could paint the wood some interesting color to match your curtains and comforter.
I think taking the doors off the closet may be good if you truly don't need a lot of shoes and clothes. Buy some of those crates and place on their sides for storage as shelves and stack them. You may be able to turn the closet into a computer center. Putting a counter top in there or something to keep your space a little more open. Call a local kitchen remodeling company and see if they can sell you a two foot section or something.
Maybe a lock on frige.
Go to Walmart and buy the risers for the bed. You get like 8 inches or so lift by placing them under the four corners of your bed. This gives you immense amount of under bed storage. I have the plastic container on wheels under mine to hold like accessories.
Most importantly . . . get a puppy to share the bed. Remember cats will eat fish. That could mean a lot of trouble for you. You're such a nice Fishy.

Rachy