I know. It can be very intimidating and frightening.
But you mustn't let stress take over you. It's not going to help.
You need to understand how much pressure your school has, to be able to turn out amazing students. VCE schools have very high expectations of students, especially the one on scholarships. I hope your parents understand this, because if, in any case, your scholarship gets withdrawn, they aren't going to be fuming with anger. As Summer Rose coined, pressure is why they give out an overwhelming amount of homework, practice tests...etc..
All you need to do is, get some support. Start with your parents. Explain the situation to them, and tell them how your feeling. Make some visits to a psychologist, who may be able to talk you through this.
Then, try and talk with the school. Just because you're on a scholarship, doesn't mean you will not be allowed support. After all, the school expects you to graduate as an exceptional student, not a depressed one.
It really is possible. Try discussing the issue with a teacher, coordinator, manager or head of house. They will hardly ever say no to supporting you. They may be able to reduce the amount of homework assigned to you, give you a separate room in an examination...etc...
Keep in mind that schools are literally RANKED. They want to achieve the highest position possible.
Back to the subject. Now that you have some sort of help, try find some time to do extracurricular activities, such as play sport, study music, go to cooking classes, and so on. Extracurricular activities can help you find a balance in your life.
But none of this is an excuse to not be happy. Make some friends, and hang out with them. Friends can be a vital part to getting out of that "generally sad" zone. Just have the courage to do introduce yourself. Then, find a hobby that you like. Again, explain the situation to your parents, if they disallow you from doing such a hobby. Also be optimistic at all times.
Happiness and optimism will keep you "immune" to all your troubles. What I mean is that you'll make a quick mental recovery and it won't hurt as much as it would when you are depressed and lonely. A good outlook and mood will also help you balance out your life and not let troubles take over.
Hope this helped,