Where To Hide My Diary?

I've just bought a diary because I have an insane temper that is really short especially when I get really stressed with problems. So, I bought it so I could vent and that way I wouldn't lose my temper and punch a wall or even worse a person:L I have two brothers who wouldn't really search for it, but if they did find it they would definitely read it and so would my Mum. Only my Dad wouldn'tread it. I don't wear to hide it! I can't hide it in ceiling tiles or under floor boards, I can't tape it to or under anything, I can't cut my matress and slide it into it, I can't cut a eddy and put itin there, I can't hide it in a trash can or under my pillow or somewhere in my wardrobe and I can't make a hollow book. And finally I can't put a lock on it and I don't want to buy a new one because I love this one plus I can't be trusted with lock because I'll definitely lose the keys. Any suggestions?! Oh and I can't hide it under any drawers on in any! Help!! Thanks in advance!