Women will have different size vaginal canals much like men have different size penises. However, with sufficient lubrication and foreplay the vagina should be able to handle most sizes. There are some women however that this might not work for, and your girlfriend could be one of them.
I don't think that the burning sensation after sex is anything to worry about, however your girlfriend could visit her family doctor just to ensure that there are no other problems that could be caused by your penis size.
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