The answer to that is quite simple: be pleasant. Speak about pleasant topics. When others comment or ask questions, respond in a pleasant manner with pleasant words and pleasant affect. If you try that consistently you will begin to see people responding differently to you.

If you try that with everyone you meet and don't feel that a single person responds in a nice way, I recommend that you consult with a doctor because you may be experiencing paranoia and psychosis. Those are real problems and can be addressed by medical professionals.

Peace to you.