Yeah, I do know what it's like , got an 18yr SDD too!

No hobbies, no sports, no interests, wanted to leave school. I was so totally against it, but she ended up running off to her bf's. She gave us the old "I want to be a haridresser' routine. Left school, did nothing for nearly a YEAR. It was excruciating to watch.
She says she was handing in her resume everywhere and that was it. the resume would have only consisted of her name, address ph number for pete's sake. Her school grades were terrible so no good putting her report in.
well finally (after whining about how c'link were on her back to find a job, and how she actually had to pay to go to TAFE), she started in the Deli at Coles.
She's doing well thank god. The only thing I could do was keep reminding her she if she wanted shiny things she has to make the money to pay for them...

*steps on soapbox*

This is why parents need to round their children out and encourage hobbies and passions. When I look back at my own friends, myself and all the kids I used to work with at C'link the things that strikes me is the ones with no education often have so hobbies or sports anything to belong to either. So if they don't like school they have nothing else to do. Literally.

*off soapbox now*

You gotta keep the little buggers busy......