Re: women on top...
Oh, I don't know how it could hurt him; but I am pretty sure that (even if it is true) was just one time thing that could be improved by talking to him and just starting more carefully in future.
Otherwise, he might have the issues my dear love used to have - fear of losing control and losing masculinity through that. I had to have careful conversations and provide reassurance in my boyfriend's performance for about a year... until he finally felt that it is OK for woman to be in control too and it doesn't take anything from his skills.
And you know what, now me on top (with him sitting) is our favorite position of all. It helps me to find the right, most pleasurable for me angle; it helps him to relax and concentrate on pleasure, and to enjoy seeing my body moving.
So. You are not the only one. If you really want to achieve the best with him - be patient.