Thanks man for your insight, I'll try to follow your advice!If it is about sexual performance anxiety - if you are able to hold a conversation or are excited but not overly nervous like in a panic state - then face it and focus on the experience, the sensation of touch, turn down the tempo, let things unfold, forget about your ****, it is your experience - when you enjoy the sensations, you will automatically calm down and your brain shuts down and stops punishing you to perform a porn scene or some other bull**** from your mind. When you are in the act, embraced with your "animal" brain there is no anxiety. Try to focus on the first thing that you enjoy. This is your first step telling your brain to ease into enjoyment, away from performance and acting and must and pressure.
If you have general tension - incorporate more thiamine with magnesium - this raises your natural gaba and you should feel more relaxed in general. And if it is a problem coming from porn use - you know already what to do. Focus on your physical pleasure not the pictures and sequences you trained your brain to feel arousal to.
It takes time but it is worth it. Sex is enjoyable not a ****** duty.