I am 19 years old. I have a girlfriend who lost her virginity to me, I know she is clean. Even still I always use a condom. I haven't had sex with her in at least three weeks because I have been on vacation and she was on her period. IN short, I know this isn't an STD. I have not been able to get erect for 2 days. I have tried watching porn and nothing happens. I have tried playing iwth it and nothing happens. I have tried everything and nothing happens. My penis feels numb, there is no feeling in it at all. It has shrunk in size as well. What is happening to me? I am a healthy kid. I don't smoke. I only weight 148 pounds. I work out regularly.