Alcohol is often the least of our problems, because the alcohol is often a symptom.
It sounds like you are very unhappy with your life and unsure what direction to go in. I really hope that you talk to your dr about the depression. I don't know if you are taking antidepressants but with your family history and the way you are feeling now, they might help a lot. It's something to think about.
I agree with what Scott said. I think pointing the finger at all the other students and saying they are not nice or good is not helpful. Instead of doing that, how about taking action and trying to meet one person at school that you can relate to and talk with? You can change the course of your life if you want to.