Are you a dependent on someone else's return? The Standard Deduction for an individual for whom an exemption can be claimed on another person's tax return is limited to the greater of:
…..$1,100 or
…..Your earned income for the year + $350 (but not more than 12,400)
So you would get a minimum of $1,100.
See Publication 501 worksheet on page 25
http://www.irs.gov/pub/irs-pdf/p501.pdf
