First of all, don't go judging the reactions of real women by the women in porn videos. Those women are paid to act that way.
Secondly, there is no medication that is going to increase the size of your penis. There are techniques that involve "stressing" the penis that increase size. However, they haven't been systematically studied so we don't know what the long-term effect of it is. I suspect it works by weakening the walls of the blood vessels, allowing them to expand further. That's just an educated guess; however if I'm right that could make you more vulnerable to an aneurysm in the penis.
There are surgeries, but the results have been very mixed, with only about a 50% to 60% satisfaction rate. Most men who request the surgery actually have a penis within the normal range. If a woman walks away from a good marriage over this, then you're better off. She wasn't stable to begin with. I've never know a woman to leave a man over penis size alone.