Article in English: Perhaps the most effective way of getting rid of an obsession is to talk about it with a psychologist or other mental health professional, such as a psychiatrist, or licensed counselor.  You can find a local psychologist using this website: http://locator.apa.org/  You can find a local qualified mental health professional using the site: https://iocdf.org/find-help/ Sometimes a friend or a family member understands you better than a psychologist, simply because they know you so well. Keep in mind that this doesn't mean that they will necessarily be able to rid you of your obsessive thoughts better than a professional can, but it might mean that you will be more relaxed and feel better understood talking to those you are close with. Studies show that most people, from time to time, have strange, bizarre, or worrisome thoughts. If you have become obsessed with a thought because you are worried it is strange or off or not indicative of your personality, keep in mind that such thoughts commonly occur in a wide range of individuals. It can help just to know that you are not alone in dealing with your problem. Getting rid of obsessive thoughts is no easy task and it is important that you stick to the treatment or therapy suggested by the mental health professional that you visit.  Typical treatments for obsessive thoughts include: cognitive behavioral therapy (CBT), anxiety medication, or antidepressants.  If you are in doubt, get a second opinion from another therapist.

Summary in Indonesian:
Carilah bantuan profesional. Bicaralah pada keluarga dan teman. Terimalah fakta bahwa berpikir aneh sangatlah normal. Lakukan terapi secara berkala.