Dear Welcome to HCM We understand your concerns I went through your details. Impotence or Erectile dysfunction (ED) is sexual dysfunction characterized by the inability to develop or maintain an erection of the penis during or sexual activity or before sexual intercourse. Psychological impotence is where erection or penetration fails due to thoughts or feelings (psychological reasons) rather than physical impossibility. The most important organic causes of ED are cardiovascular disease and diabetes, neurological problems, hormonal insufficiency and drug side effects. I do not think, being an youngster, you have any of the above problems. In that case, your reason for ED could be purely psychological. I suggest you to consult a psychologist for sexual counseling diagnosis. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible. Hope this answers your query. Available for further clarifications. Good luck. Take care.