Why can't I get an erection and have no sexual desire?

Human sexual response is a little more complicated than a simple reaction to stimulation. A good bit of influence originates between your ears, rather than between the legs. And it's not a trick pony, which performs as ordered, on cue. The best place for you to start would be with the family doctor, for an exam and frank discussion of the problem. You would need to eliminate a physical explanation for the trouble. However, given your age, the trouble is likely just to be in your head. At your age, there is a lot of stress and pressure to perform. Sex drive is also linked to how tired you are, your overall nutrition, and the company you have. It may be you simply do not find the young lady a turn on, and your penis has more sense than you. You might be a little wigged out about the prospect of having sex, and the potential to disappoint, or even become a father. And stressing about the failure to perform as you think you should can certainly not help matters either. So see your doctor, make sure everything is okay physically. Then chill out on the rest. When the time, place and girl are all correct, chances are good everyone will perform as advertised. Until then, it just might not.

Your penis is not a toy that you just plug in an it does tricks! Human sexual response is complicated as stated above an if you are just in it for the thrill, then it will lose its appeal. You can't force it or obsess about it becuase then it might just fall off someday. Give sex a rest and REALLY get to know your girlfriend. And see a doctor. Or at least park outside the hospital an look at one.

There are several potential causes for your issue (eg low testosterone, drugs, stress, being overweight, prostate issues, etc) Or it may be nothing of concern and you may need to just get more comfortable with your partner. Nobody can say for sure over the internet. So, your best bet is to go see your doctor, but for this to work you have to be completely honest and forthcoming. Good luck!

stop thinkin about it, and just take a break, try working out, get the testosterome pumping

you might want to go see a doctor