My experience with porn (and I have seen a lot) is that it's the worst thing that has happened to sex ...EVER. It creates unrealistic expectations of what sex is and can be. And this penis size thing is very stereo-typed. I have seen large and small on ALL ethnic races.
Also, if a man is well endowed then the porn industry will put him in videos and everyone thinks he is "normal" but there is no normal. Don't base your real life sexual experiences on porn or else you're in for a world of disappointment. The trick is finding a partner who is compatible with you which means, at the core, they enjoy the same as you do. There will always be some differences but that's actually good. But when you're with someone who is totally incompatible, sex will always be difficult and forced. You first have to be comfortable in your own skin and not be afraid to know and voice what you like in sex. Or at least this has worked for me