Hi,
Thanks for the query. I can understand your concern. You should evaluate yourself for now. Just check if you are getting good erections anytime in the day like while waking up in the morning, etc. If yes, then it rules out organic problem as such and is more to do with psychological issues rather. If no, then organic problem is to be suspected and that you can get it evaluated by a Urologist and also you shall need a color doppler study.