All I want is a simple and happy life

I have kind of some similar problems. I feel I am snapping anytime soon..but I know I cannot snap because I have seen some of my friends 'snapped' and never ever been 'normal' again. If I snap, I will make my parents sad. If I end my life, I would make them even sadder. I have pressure from my family to succeed, to earn lots of money, to win my relatives, so that I won't get laughed at and looked down at. I am going to be jobless soon and I have failed in many job application. I feel very worthless! I want to be a school teacher but my parents won't let me do it. They say it is a waste as I am a doctor. I do not want to upset them yet I am upsetting myself. They have spent so much money and effort on me, and they have all their dreams on me so that I can bring them out of the 3rd world country...but I have no ability to do so. All I want in my life is a simple and happy life with my family; but I can't even get that.