It is really unfortunate to know that you are getting reduced libido and sex drive. You should be concerned about the symptoms you mentioned here, I think. In teenagers, libido reduction is what occurs at times. However, it is not so common in youngsters, to getting affected with erectile dysfunction. You might need a detailed medical checkup, if the situation is persisting for more than a few months. I think your problems are more psychological than physical. If they are psychological, you can get it cleared through a successful medical counseling. Prior to that, try keeping stress and tension out of your sexual life. Don’t get anxious about your performance or libido, at all. Just try a relaxed method to approach your partner. Your family doctor also can help, if you are having light mental issues than complicated ones. Your physician can help in advising you better with medications, supplements, nutritional deficiencies, hormonal problems or penile problems.