Hello Friend, Every individual will have certain limitation by nature, but they possess certain other strengths. It is up to us to play on our strengths and improve our weaknesses. Your weaknesses is, being alone or not able to mingle with people. Being a working professional, I believe you can easily overcome this by  tweaking few perceptions and changes in mindset . Its all about whether you want to take the first step to connect with people or you wait for others to start!!!

Hi thanks for query. Based on the statement I think you have socializing issue / social anxiety, it might be because of low self confidence / inferiority complex, distress about your self in different areas is leading physical illness. You can take the guidance from psychologist, identifying and suggestion about different skills in various areas along with counseling will help you to be better person.