The world only cares about what it can get from you, and that includes your friends and family. No, I'm not telling you to get rich. Start learning useful skills today, and make yourself the human equivalent of a Swiss army knife. Become something that people will want to keep around, and you'll be swimming in options for the rest of your life. Someone like you will appreciate those more than money.
You might start to think that you hate people, but you don't. Just accept human nature for what it is, and learn to control it. Now take that power and use it for good. Instead of using it to exploit people, use it to better them. Keep your relationships mutually beneficial, instead of parasitic. Put your brain to work and outsmart the competition, but stay true to your values. You'll love being cynical.
Oh, and get some sun every once in a while. If you're feeling depressed, that might be why. Biology is weird.