Sometimes worrying is counterproductive. You may be worrying about an STD or an STI that you do not even have. The best thing you can do is order an STD test kit, wait for your results, and if an STD happens to show up, contact a doctor. If you test positive, it is NOT the end of the world. Everything will be okay. You will get treatment and it will help! Stressing and worrying is not healthy and it will not help. From this point on, make a promise to yourself to be more careful in the future.