My penish is very small. i can't make my wife happy. what to do?

Sex and Men: Size is very often not the problem here. It is what you do with your penis, your fingers, your tongue. This is not the forum to teach you how to have sex. I often recommend that patients or couples get a sex guide. This is to learn the variety of ways to have sexual activity. Sort of a how to have sex manual. The common one my patients get or start with is called "the joy of sex".