Why do I lose money

[hunter.chief]

I suggest you start single-tabling. Try to concentrate on improving your game and forget about the money. If you can't at the present limit you should go down a couple of levels.

And 10/4.5 seems too tight and too passive to me. Start playing aggressively.

[Poker Plan]

As others have said:

Too tight
Play just 1 table for the time being- until you are sure the big leaks have been ironed out.