I'm assuming you are a guy.
The first step is just to talk to them. Explain that it was your first time, I doubt they will judge you too harshly. Everyone has a first, I bet her first was cringe-worthy as well (or not if this was her first, but then she won't have anything to judge you off of).
What I find helps is to masturbate for several days in advance, and even the morning of. You will find that your endurance increases by quite a bit (and in my experience, it isn't any less pleasurable for you).
Take this experience in stride, and I bet in a couple months you two will laugh together about it.
· 10 months ago