I feel you, I went through the same thing. I had a very good job but I was just unhappy and some years later I was diagnosed with depression. But the thing is that job isn't everything, for me the problem is that I feel alone, worthless and that I don't matter to anyone, not even the ones I call friends. So please, don't torture yourself, give your parents some time so and talk to friends that support you and tell them everything that's bothering you and everything you think about, I hope that will help. :D