as others said, nothing is wrong with you. and if your gf doesn't have much experience, it makes sense she'd be worried about her own performance (as mentioned, many guys can't go that long even when they want to!).
just do a lot of reassuring for her...tell her frequently that you love what she's doing and how it makes you feel. if she starts getting really antsy--tell her it feels so good you don't want it to end (orgasm). just be careful that you don't go so long it starts to hurt. all that friction can get painful after a while--particularly if there isn't enough lubrication (natural or bottled).
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