HOW DO I SOLVE MY PROBLEM, PSYCHOLOGIST OR WHAT?

Hi, I do not know what is wrong with me. I am always sad and feel like a failure in life. I am a little bit older and went to school really late in life since I never had any money . I am what you call a nice guy, but I always get slapped in the face by people that I dont even know, I do not consider myuself a charmer , but I am very respectful in my ways of talking to people and relating to them , but I always get the harsh answers , the over the shoulder looks, especially from people that don't even know me and I am sick of it. I am about to become a profesional and I always been a loser with women and rffriends , I do not know. I used to have friends that we grew up together , but I moved to this country in my early adulthood and I couldn't make a real friend. I trusted this guy and he treated me like a real friend for 2 years and then he disappeared , we found each other 2 years later and again , our friendship lasted for another 2 more years and suddenly disappeared on me again without notice, it is true I moved to the next door state , but this was known to both of us, was a matter of work , he changed his phone never an explanation , nothing. I have been married to the same person for 20 years and she loves me a lot , she will do anything for me and still looking on the internet with these stupid fantasies of finding a beautiful princess !!! please help me , why I am I doing this things? shouldn't I be happy? there are a lot of lonely people and I have at least somebody , but I feel I can't connect, Am I going crazy? help why am I here today and not enjoying life?? kf