After seeing my wife physically respond, to much bigger cocks, unlike anything I ever made happen, I had to admit and accept my limitations. Further, I had to find a different place in her sex life. I am her husband, her partner, her confidant, and the guy who can always give her orgasms. But I'm not her lover, I've learn to enjoy being a toy she plays with and have no desire set myself up for failure by to trying to compete with her lover. I'm no longer am interested in traditional sex.
Different cuckolds evolve to different places. Some are dominant. Some are submissive. Some enjoy humiliating, while others prefer being humiliated. You just will have to find your place, a place that can and will change over time. For now, enjoy the intensity of the ride.