I am a 25 year old guy. I had sex for the first time today, but it didn't go as planned. O had a good erection after the girl massaged my penis, but during penetration, it started to become flaccid. It happened twice, and ultimately I was unable to do what I wanted. I am feeling extremely embarrassed and sad. I had an exam today, so that pressure was also there, along with I didn't have my lunch. Anyways, what could be the reason for this? I don't masturbate a lot. I am healthy in general, and I get erections in the morning everyday. Is there any natural way to get rid of this problem? I sincerely need help.