I am a 16 year old male and roughly a month ago I had sex with my girlfriend and it went fine. We recently tried to have sex again and I couldn't even get close to being hard, I tried everything but nothing worked. I tried to put it in even though it was flaccid and as soon as I penetrated I ejaculated (I was wearing a condom). its been a couple of days and I can't get hard anymore, it just won't go up. I don't have depression or anything. Someone please help