It is common for males that retract the foreskin for the first time to feel pain and discomfort.
Simply, the penile mucosa on the glans needs more friction to become harder and to be less sensitive for pain. You might achieve this by more frequently keeping the foreskin retracted.
If the glans hurts when it touches your underwear for example, then it needs more time. However, do not keep it too long (for hours), because there is a condition in which it might be painful or even impossible to turn it back.
Keeping the foreskin retracted several minutes every day would eventually help you. You might use lubricants to decrease the friction. Even in grown up men, the intercourse might be painful both for the male and the female if there is not enough lubrication. Most of the lubrication is provided by the female genital glands, so you have nothing to worry about.
Just keep retracting the foreskin every day and the pain would disappear in time.
You might want to visit a urologist for additional information on this issue.
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