I'm like you but I'm a bit younger than you. I was too depressed to go to school and missed a lot of school. One day I was told I wasn't welcome at the school any more and to have a nice day.
So it's a year later now and I can't get into any other school. I really regret being so lazy and not going to school. First it started out as taking a day or two off a week to sleep. Then it was attending five weeks per semester.
Now all I do is sleep and browse the internet. Eventually I plan to get off my arse and do something about it.
So while you're at it can somebody help me with an Australian solution to OP's problem. We don't have a GED as far as I know.