>>33877671
It"s normal for the first few times. I had the same.
Mentally: Go to a massage place with a happy ending first. You have time to calm down there during the massage, and you don't have to do anything yourself.

Physically: Sex is very different from fapping, it is much easier to fap.
Your hand is faster. When you're close to coming, you really have to speed up your hips, as fast as your hand would be. If you're uncertain, watch some leaked videos to see how people have sex normally, when it's not for producing porm.
During real sex, when the time comes to come, you have to go for it. This is different from watching porn. When you're watching porn, you scroll around and keep swirching between videos, that's what keeps your erection and attention up. It's how the brain works. In sex there is only one girl, you cannot extend it like you usually do, you have to go and try to come.

If the erection is gone for mental reasons, you can wait 10-15 minutes and go again. Trying to push it to get it up will not work.