Regiusloki, mine did the same thing for the first 2 months or so but the difference already is night and day. When I open his cage he "runs"....but doesn't hide any more.
He's 7 or 8 months old and was out exploring my living room (supervised of course) the other day. He was determined to get into my girlfriends purse (which I'm sure smelled like mice because she works at a lab full of them!) and after picking him up and pulling him away from it a few times, I swear he turned and gave me the "Dude, there's food over there" look....and just kept trying. I eventually just let him climb in hoping he didn't poo.