I definitely know where you're coming from with the whole "am I doing it right? Does he like it" stuff too. You (general you, not you specifically) get so used to seeing perfection in porn and the media that any little deviation makes you wonder if you're not good enough or "what if he doesn't like the way I look". Its funny though because I know that I don't expect that out of my partners, but I expect them to expect it from me.