I'm so sorry, I had an experience when I was 17 with a girl who I thought was way out of my league and I was so nervous I couldn't get it up. So she said things like "I've never had this happen to me before, I can't believe this, what's wrong with you" etc. and it crushed me. I talked to her a little while longer and after making out for .5 seconds she did the same thing, once again making me feel like shit. So I know how you feel, and time will let you recover from the mortification of it and you'll be ok, life goes on and girls come and go. It's been almost 2 years since and it still haunts me but I had an experience with a more mature girl that helped me through my insecurities. Though they're still lingering it's getting better with time, so live life and with the next one things will be better.