It's either, your to big, she's to tight, or the fact that you may be rubbing to much. Try to use alot of lube, to get things moving slowly. About size, not much you can do, but slowly stretch her. She may also be raw, from maybe a previous sexual interaction. If you had rough sex or alot of sex in the last few days, let her heal.
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Personal Information:
Sex: Male
Age: Under the age of 18
Sexually active
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Making her feel too much pain! 
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