Your employer is required by law to furnish your w-2 by January 31st.
"If you do not receive the missing or corrected form by February 14th from your employer/payer, you may call the IRS at 800–829–1040 for assistance. You must provide your name, address (including zip code), phone number, Social Security Number, dates of employment,your employer/payer's name, address (including zip code), and phone number. The IRS will contact the employer/payer for you and request the missing form. IRS will also send you a Form 4852 (PDF), Substitute for Form W-2 or Form 1099-R."
How old are you? How much money did you make? Are you claimed as a dependent? Do you have any dependents? What is your filing status? Are you a student? Where do you live?
Since you haven't contacted the IRS, and you didn't file an extension, you might want to hire an accountant at this point. Unless you feel comfortable filing the forms, etc. yourself....