It sounds like your employer made a mistake. Box 1 should include your wages plus your tips minus any pre-tax payroll deductions like health insurance. If you have no pre-tax deductions, box 1 will equal box 3 and 5.
You have two choices. You can contact your employer for a corrected form, and file the automatic extension request so you won't be counted as filing late. Or, you can enter what you think the box 1 number should have been, and check the box for "substitute W-2" on the page of special circumstances after you enter the numbers. Using the substitute W-2 form may result in the IRS sending you a letter asking why, so make sure you keep all your documentation of your wages and tips.
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