Parents are tough to deal with for Type1, especially during adolescence (and even through adulthood). I would look for a local chapter of JDRF in your area with other type 1s or at least peruse juvenation for other people your age.
The important thing to remember here is that you are not alone and that there are other people that have gone through and are going through what you are experiencing today. Another type1 can help you see that you may have some issues in common. Whether it is a peer in a similar situation, or an adult that you trust, it is important that you talk to someone!
When I was first diagnosed and I was away from home during my teens, my parents where a bit overbearing when it came to my care (though I went to boarding school and controlled my disease all by myself), so it was tough to explain to them that I needed them at times and at other times I was OK (my diabetes was not a topic that always had to be brought up and also not in front of everyone).
Let´s see if some peers respond that my be in your age group that might provide some insight, but I suspect we have all gone through this in some way/shape/form at some point or another regardless of age.
You are not alone, and it will take some communication with your parents to ´train´ them about privacy and who you would like to handle your diabetes in public, especially in the teen years where we seem to be more sensitve than normal (adolescence is already a tough age, add diabetes and it becomes even tougher!).