Practice and more experience.
I'm a one shot guy, and if I come early, the game is basically over for me.
I usually tell sp when I am sensitive and close early in a session so that I can take control and take a brief break, change positions etc.
Also, find a way to relax. Stressing out about things will negatively impact your performance. For me, I exercise in the am, limit caffeine and arrive early. These help me walk in relaxed.
I recommend against pregaming/masturbating or using cannabis/ alcohol. Those activities reduce my libido. I also would avoid thinking about a family member. I feel like that could create some weird mental associations or ruin your vibe entirely. To each their own.
Hope that helps. Good luck!