Others are regretting an encounter with a sex worker.
If you are diagnosed with chlamydia, gonorrhea, HIV, hepatitis, chancroid, or syphilis, your doctor is supposed to tell the local health department - which will then inform the CDC.
STDs are classified as reportable diseases for a reason.
Hopefully, such surveillance can then allow local, state, and national organizations to design more effective intervention programs that will help keep more people from being infected in the future.
If anything, the doctors who practice at free STD testing clinics are likely to be more sensitive to your concerns about social stigma and other related issues.They deal with patients with STDs each and every day, and so it's highly unlikely that anything you can say will shock or surprise them. Fortunately, whether you choose to get tested and treated at one or another of your local free STD testing clinics or at your doctor's office, the disease reporting shouldn't be a burden on you.