(((Golightly)))
I'm sorry you're having such a rough time.
You know, life transitions can be very stressful. Even ones that are supposed to be happy and exciting, like graduating high school.

I don't think anything is wrong with you, and I don't think this is just your personality now. It just sounds like maybe you are little lost....

I agree that you need to get of the house more. Even if you can't find a job, could you find a place to volunteer? Sometimes volunteer work can actually lead to job opportunities, and if nothing else it looks good on a job application.

Did you have any interests or hobbies in highschool? Do you keep in touch with any friends or classmates?

Another thing you might think of doing with all your free time now, is to figure out a way to go to college. Even if it is just a few classes a semester. There are lots of ways to apply for scholarships, grants, and loans. A little research on the internet may surprise you.

Wishing you the best....