I am familiar with the awkwardness. Although I am an average height fat guy. I have always had a tough time finding women, but when I finally got one and got naked it was "OMG, How big is that thing?"
To their credit, no one ever got dressed and ran from the room, but not very many were excited about fucking my cock. Most decided that sucking it would be easier, and if they decided to try and fuck it, they almost always got on top to control the depth. Lots of lube.
So, you need to just do the opposite of what I had to learn to do. I had to use positions that used a lot of cock just to get into their cunt. You need to use positions that let you get all.of your cock into them. Let them get on top. Or get their legs over your shoulders, so you can get into them.
Realistically, a cunt only has sensitive nerve endings in the first couple of inches. Women think they want bigger cocks, but they cannot actually feel one until you pound their cervix a few times.
I agree, a solid 6 inches long, and around would be perfect. But it is what you got. Good luck.