| It's truly awful that your doctor's so cruel. Were your parents there at the time? Do they know about this? The others' ideas about trying to switch or asking to see a dietician or a diabetes nurse educator are good ones (especially if your dad's suggesting you *eat*--that might make him more open to the idea, whether that's the problem or not).
It's also true about the hormones' affects--they'll really turn your life and BGs upside down.
Does your school have a nurse or a guidance counselor? Is there a teacher you like a lot? Even if they're not experts in diabetes, it sounds to me like you need someone on your side, who can help you get your bearings, maybe help you talk to your parents if they're not being sympathetic. | 
