Feeling Stress and Unknown worries.

I am feeling so much stress and much presser in my day to day life. Always some unknown worries come to my mind. Not able to concentrate on my career. So much scared about my life. Feels like I am going to mad. I have so many friends but don't have any connection with them from a long time. Feeling very alone and lonely. Feels like on one with me I am alone. Not interest to do any kind of work. Always thinking about something. Getting very emotional and sometimes feels like very aggressive. Lack of confidence to da any kind of work. Feeling very guilty whatever I did in my past. The past bad memory always bothers me to do any kind of work. And I always thinking about that. Forgetting things and absence of mind. When I saw other people with so many friends and enjoying their life happily I am getting bit upset, why I am not happy, why I don't have any connection with my friends. Need a friend who understands my problem and helps me to live my life happily more than a doctor. Thanks :)