how can you be so sure?
I want to believe that, but I can't.
No, you are not screwed for the rest of your life. It may take a few more years before the crime becomes old enough that some employers won't hold it against you. There are almost always employers willing to work with people with minor criminal history issues. Try going to some job fairs. Look around to see if there are any local support groups for those with criminal histories. They will often have a line on who will or won't hire. That being said, you may have to work some less glamorous jobs for a few years. Check your state unemployment offices to see if they offer any resume or interview workshops to make sure you are up to snuff there.
There are rules in SC on when an employer may hold a criminal history issue against you. Look them up and study them. Small employers may play fast and loose with those rules but the larger companies are more likely to be worried about issues with the state. I stand by what I said before, it's more likely something else is tripping you up.
According to his other thread he has no convictions.
And according to OP, it was already expunged. Which is why I believe it's unlikely that it's his expunged record from holding him back.
I personally know people with FELONY convictions who have gone on to have great careers. Perhaps it's your negative attitude that is coming across loud and clear to employers. Or a crappy resume. Or your applying for jobs that are (for now) out of your league.
There's a really good site (google Ask a Manager) where you can find resources on resumes, cover letters, and interviews. Check that out and see if there's perhaps something you're doing that's holding you back.