Hi sir, Welcome to Health Care Magic, I can certainly understand your concern and fear about your sexual performance. but there is nothing to worry as I can advise you some measures. It seems that you are more anxious about your sexual performance. it is very important to be stess free and get relaxed before sex, and schedule your day with some time for sexual relaxation, I can advise you to maintain adequate weight , avoid alcohol and smoking if any , perform some pelvic exercises and regular exercise to maintain adequate weight .I can suggest some drugs to get rid of your anxiety, stress like SSRIs ie escitalopram .you can consult your psychiatrist for further reassurance , counseling and guidance. On top of it if you feel there s no improvement you can try with drugs like sildenafil, which helps in production of nitric oxide ie NO , which is very important for sustaining your erections for long time and also helps in preventing premature ejaculation