Sex is about more than the penis and certainly more than penis size. In fact, research has suggested that men care a lot more about penis size than women! Only about 1/3 of women are able to consistently orgasm with penetration alone. Have you tried stimulating the clitoris during sexual activity? Or having her stimulate herself while you’re inside of her?
Also, try to make foreplay last a little longer than usual and see if that helps. Engaging in some playful teasing for a while prior to penetration can build up arousal and desire making it much more likely that sex will culminate with an orgasm. However, I do want to note that making sex orgasm-centric isn’t going to help. Try not to focus on orgasm because sex can be really satisfying, with or without orgasm. Consider the orgasm just the cherry on top of an already delightful sundae.
