Everyone fails sometimes. It's about getting back at it that counts. You're only 20 and you've already tried something most never attempt. Who cares if you failed. Who cares if you're living with your parents. Who cares what your friends say. As long as you learn from what's happened, it was worthwhile.
You can always find another job. Sure, maybe not one as good as the last, but you can find something. And you can always try again in terms of starting your own business. So, don't worry. You'll be okay. It's all about attitude and perseverance.
You just need to take a step back and assess what happened, why it happened, and what you can do to go from here. You're just 20 years old. You have your whole life ahead of you!
Good luck!