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I would guess it is either physical, psychological, or physiological. You have to figure out what it is.
Ask yourself these questions. How often do you masturbate, and is the technique you use hard and fast? How long do your erections last watching porn by yourself? How good is your diet? Do you eat too much sodium? Are you on any medications? Are you using condoms? How good is your blood pressure? How long can you run for? Do you find her attractive? Do you try different positions? Do you focus on pleasuring her? Do you focus on what you are feeling in the moment? Are you worried about anything when having sex?
If you have to go to the bathroom in the middle of the night, a full bladder can make erections easier.
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