How long have the two of you been living together. She needs to understand that she moved into YOUR house and she cant make you change everything. Fair enough if it looks a little messy then try and keep it clean but shes also trying to change you. Thats the way you are and she doesnt have a right to move in and try and make the place how she wants it. Its your house you shouldnt have to get rid of the things you love just to make her happy. Have you sat down and talked to her about this? Maxbe you could move all your cars and magazines to one room and tell her shes not aloud to mess with then because its your little place of zen lol hope you two work out the problem soon. Good luck. Sorry if i wasnt much help. I know how annoying it is when people cant leave your stuff alone!