Hi all, I'm having a real issue that bothering me. Not sure if this a dysfunction or just temporary.?

I met this girl at the club and we were both interested in each other. We had some drinks including shots. After few hours at around 2am we decided to go to my place. Since I coudlnt drive, we walked around 5km and went to my place. When we decided to have some action, I was surprised to see that my manhood was flaccid and unenthusiastic. When she helped with her hand I got an but when I try to get in, it will go away again. I havent had in a while and I was pretty nervous about keeping her satisfied. I never had problems when I masturbate. Please advise if this is normal or not? :( I'm really depressed and lost confidence now.