You're probably asking in the wrong place as most of us girls here have a preference for bigger penises.
Saying that though, for me it's mostly psychological (sex that is) and i get the majority of sensation from my clit. Big dicks are good for a full feeling, but really it's the idea of them being so big that really turns me on.
If the girl likes you and you are confident and a bit dominant in bed, then you'll probably be fine. If you act insecure then nothing you do will be any good as you'll make her nervous.
Also, almost anything feels big when you're a virgin unless you've been using toys beforehand.
You should be ok, but i'd suggest not visiting big penis websites because you'll probably give yourself a inferiority complex. Truth is just like guys women all have different tastes, there isn't one rule for us all!