You get either the standard deduction or itemized deductions, not both.
If you want to, for some reason, you can take itemized deductions instead of the standard deduction, even if the itemized deductions are less than the standard deduction. But you will pay more tax that way.
If your filing status is married filing separately there are additional considerations and you might not be free to choose which deduction you take. You have to coordinate with your spouse.
