hello Thanks for your query.You had been indulged in masturbation since last 20 years and now facing problems related to sexual activities.First of all there is myth in a mind of common man that excessive masturbation is the reason of all sexual problems But I would like to state that it has been discussed in scientific forums all over the world and proved scienificaly that masturbation does not have any negative effect on any organ or system in the body.Al the problems that you are facing now are mind related and due to anxiety. Following measures will help to boost up your level of confidence and allay anxiety and there by improve your sexual performance, 1) Practice moderate exercise for 45 minutes followed by meditation for 1/2 hour. 2) Take high protein diet rich in vitamins A,C,E,D.fruits and vegetables . 3) Avoid alcohol and smoking . 4)Take some anti oxidants like Almonds 5-6 everyday. In addition too this you have to discuss the issue with your wife as her cooperation is equally important to overcome these problems.You may take 5 phosphodiesterase inhibitors(Sildenafil) along with Dapoxetine to be taken 1 hour before intercourse Please consult some qualified sex therapist to modify and learn some techniques to delay ejaculation..You can get prescription of these drugs from your family Physician.