Presumably you have a job, or you have parents with a job that are supporting you, or you live on student loans given to you by people who expect that you will get a job and pay you back with interest. If there's a hypothetical machine that can do your job, then you won't get one, and there's no reason other than charity for anyone to give you money.

Until now, if a machine took a job, that just meant that another worker was available for another job that a machine couldn't do. Machines are pretty dumb, so that's not hard to find. A kid with Down's syndrome can sweep the floor at Taco Bell, but a machine can't. That changes with the singularity.