Hi Saikat, Thanks for posting in HCM. I understand your concern. What problem you are describing is more of psychological than physical one. Size of the penis has nothing to do with sexual performance or fertility. It is proper technique which matters to achieve satisfaction. Hence, do not be worried about it. On first few occasions of having intercourse, you may not get proper erection to sustain it longer. Also you may ejaculate early or sometimes may not ejaculate at all. This is not to be considered as abnormal. You can build you confidence by practising behavioural therapy like pause and squeeze technique. Spend more time during foreplay. Also, doing meditation would help you to overcome anxiety and keep your mind balanced and healthy. Over a period of time, your confidence will improve and you will perform better. Hope the information provided would be helpful. All the best.