im not a native english speaker so sorry for any mistakes so me and my girflriend (M15 and she is F15) agreed to give me a handjob and i didnt think much of it until the day came we were chilling on the couch and she said “do we do it now?” and i instantly became nervous I was trying to gain courage but then suddenly I realized I couldnt get it up so i went to the bathroom to try to get a boner but it wouldnt come up so my thought was to get some porn on to get the boner and i started stroking it to get it up and it wasnt working until i realized i was about to cum and i came i ejaculated totally flacid and i realized I wasnt going to get a handjob so I walked up the stairs in shame and told her today wasnt going to work because I was too nervous she took it well but i feel like she knew I couldnt get it up does anyone have any tips to make sure this wont happen next time please.