Just relax - every guy gets "performance anxiety" the first time, so just relax. Since you screw with your brain as much as with your penis,make sure the first time is done in a private setting, with soothing music on if possible, and low light. Be gentle with your girl and go slowly and follow her cues as to what she likes or dislikes. Assess your best attributes and make sure you make them obvious to her. Let me know how it goes...
You should start "Porn for nerds". You're not allowed to reach orgasm till you write Pi to 1,000 places.
Take it steady, enjoy the moment. Feel her and touch her in all the places that turn YOU on. Be prepared that you're not going to be GREAT on your first go - it's natural. You will improve afterwards. Bottom line is just to enjoy yourself, move at your own pace. Don't focus on your nerves, focus on her breasts, her hips, her waist, her curves, how her skin feels etc. Just enjoy it. Best of luck.
1: Keep the vodka flowing 2: Picture your favorite porn star signaling moves from the sidelines 3: put on your favorite fuck music 4: let the screaming commence
Alcohol can ruin an erection (AKA whiskey dick) Thinking about something like porn will surly be more hurtful then helpful. Porn sex is nothing like real sex. Just relax and take it slow, spend some time with your girl before getting down to it. Even if you smoke weed id hold off on doing that the first time, there's a chance that'll actually have a negative effect on the situation (Though its unlikely :sifone Good luck my man!