fishpit.com

What do you mean "impotence"? You are only 22 and that term normally would not apply to you unless you suffered an injury to your male member,have diabetes which has impacted your penis and its blood supply,have a medical condition such as peyronie's disease, or a hormonal imbalance and other issues too numerous to mention here. If your situation is not one of nervousness where your anxiety and anticipation interfere with your ability to copulate, then I would suggest that you see a doctor pronto preferrably a urologist who would evaluate you and recommend a treatment protocol for you if your problem is physical and not psychological. But you need to consult one as soon as possible. I wish you all the best.

It's not for sure yet. You just need to go to the doctor first. Either case, there's more to life than just sex.