Help me I don't know what to do.

I can't get it up. A year ago I was in my bed with a girl I had, had a crush on for a long time, we started going at it and it ended up me not being able to get erect. I had fapped and came twice that day, and I thought that was why. However I noticed that I had problems getting reactions from my lower part every time I started drinking, I am afraid of drinking when we go out now in case a girl tries to flirt with me and eventually wants me to go home with her, I'm even afraid of doing it if I'm not drunk. I've started Nofap and I'm on my eleventh day but it isn't helping yet, will it eventually? I am deadly afraid of getting in bed with a girl and not being able to get erect, please help. It will only get erect after I rub it for a whole minut.