Stuck in Windows 7, can't go back to OSX
So I wanted to play some games (Unavailable on Mac) and I installed Windows 7 through Boot Camp assistant. I followed all the steps it gave me and then once Windows 7 was installed I couldn't go back to OSX, even when I restart and hold down the control key it just automatically boots up to Windows.
MacBook Pro (13-inch Mid 2012), OS X Mavericks (10.9.2)