How do I deal with this controlling woman?

I could only read half way, your story is too long. If you want to break it off, just move away and change colleges. Seek professional help to help you put things back on track. Show your family this post, which seems to explain things pretty well under the circumstances. Befriend a biker dude than can meet her match and take him with you to introduce them so they can trash each other to their own delight. Good luck!