>>81676882 (OP)Assuming you work 40 hours a week, that is $720 a week, $2880 a month, and ~$33,000 a year, accounting for some unpaid leave. You'll owe $3,740 in federal taxes and then anything from $0 to like $5,000 in state and municipal taxes which leaves you with, in the worst case scenario, around $25k. You should be able to live on your own anywhere in the US for this, although it might be in a one room studio in some cities.
$18/hr is less than minimum wage in Washington.