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Got some news for you, the big study from a few years ago shows that the average man and woman consider 7 minutes of actual penetration ideal with a standard deviation of about a minute and a half. 15-20 is way up there, especially if you're in her the whole time. If you're looking to go longer, you're going to have to switch things up so it feels good for both of you, look into edging for yourself and ask her what she would like most, probably take breaks from penetration for oral, hands, whatever.
As far as size, you're average, and her vagina is the result of two million plus years of fine tuning to make sure it can pas something the size of a small watermelon. The key is that she hasn't had much experience with penetration and is most likely still a little nervous and not 100% what she likes best. She may just be naturally tight and need to warm up and relax down there (this is where your tongue and fingers come into play) and just like any other physical activity, with enough practice her muscles will get stronger but more able to relax. Go slow and use some lube if she's drying out, or even suggest trying it if she thinks she isn't -- if she doesn't have much experience she may not realize that she's drier than ideal.
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