How do I get out of a depression?

Right now you need to do some self searching. Try new things. See what you want to do in life. Just because your going to school to do International Economics/business doesn't mean your stuck in that job for the rest of your life. Once you find what you want to do find a support group that will get you to where you want to go. It may be a group of friends or a professor or a counselor. These people will give you the drive to get what you want done. Also look into something that brings you joy. You don't have to follow your parent's decisions on your life. It is your life. Try to stay away from being by yourself for to long. You are right about needing to be happy with yourself, but that is found through others opinion about yourself. Like said about find a group of friends that will encourage you on what you want to complete. And try to stay away from people that only want to use you or put you down. Good luck on your life.