Chlamydia is a very common sexually transmitted disease that can be readily treated and cured with antibiotics. You should definitely discuss this with your doctor
as soon as you can, because it is very important that you do have it treated; if you do not treat it quickly it could affect your ability to become pregnant in the future if you are a female, and there are other health risks as well. For males, in addition to sharing it with other contacts, there are more serious infections of your reproductive and urinary systems that can occur and cause long term side effects. Finally, you are infectious yourself until you are treated, and can pass the disease on to other people with whom you have sexual contact. Fortunately, there are many ways that you can be tested for the condition, and, once you have been diagnosed, it is quite simple to speak to your doctor to begin treatment.
While it is always a scary thing to contract a sexually transmitted disease, you can use this as a positive motivator to make some healthy life choices going forward. You can speak to your sexual contacts and make sure that they are tested and treated as well (so that you do not become infected again immediately after being treated), and you can be more aggressive in using protection to avoid something that is harder to treat. Please speak to your doctor as soon as you can.