(Gosh, he must have been a bit on the small side indeed. Just a tip for the future, if you can't feel anything try propping your hips up with a pillow to change the angle, might help.)
But physical things aside, I think that you definitely haven't dealt with the abuse and so sex doesn't feel like it should. The physical act of sex is basically an invasion of personal space taken to extremes, and if this hs happened against your will in the past and you haven't processed that, then there's no reason for you to view sex as anything other than an unwanted invasion (and a pretty horrific one at that), since that is all you have experienced and you haven't turned it around into the positive thing it should be. You should go to some kind of counselling and really think through what you think about sex. It's not just something you do, it's something you experience with your mind and body and everything, and you need to be aware of how it makes you feel.