Well, that's not exactly huge, but it's within the bounds of okay, especially if you've got enough girth with it...But I will admit that the two worst lovers I ever had were serious tiny. The smallest, if he had three inches, was hiding one of them!
But the main reason they were both awful was that they just seemed to want to get it over with as soon as possible -- first of all, they didn't need to make much effort with foreplay, because how much lubrication do ya need for that? And then they also didn't even try to make it enjoyable for me -- as if, how could I enjoy it at all? It's like doing me a favour to not bother for too long.
So yes, you need to spend time understanding how her body works, how to hit the right buttons, and what your hands and mouth can contribute. Really, just when any bloke should learn. The trouble with well-endowed blokes is often the same -- they think they don't need to make any effort at all, since the girl is supposed to cum just looking at them!