Negative thinking, talking alone is a sign of what disease?

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Hello doctor! I always think negatively and have no confidence in myself. I often talk alone, I feel disgusted with myself. I never cry in front of other people, but when I'm alone, I cry. In front of others, I always act like I don't care if they are talking bad about me or not, but behind my back, I'm very sad. The doctor asked me if it was a disease or not? If yes, what should I do now? I hope you can advise me, thank you doctor.
P.V.Q
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Hello! With the symptoms described above, I don't know how long I have had it? Is there any psychological trauma? ... According to me, it is likely that you have a mental illness. It is best to go to the hospitals of Vinmec Health System specializing in Psychiatry to get the most specific examination and advice from a doctor.
Thank you for sending your question to Vinmec Health System.
Master, Doctor Bui Ngoc Phuong Hoa - General Internal Medicine Doctor - Department of Medical Examination & Internal Medicine - Vinmec Danang International General Hospital.