Sexual organ problems during sex?

As a 19 year old young adult, I have just had sex three times. I am afraid of being lonely because I feel that the three girls have been unhappy. After investigating, I now know that my corona is way to sensitive, and the warmth of the vagina stimulates me way to much that initial insertion is overwhelming, does anyone know what I can do to control this? Is there a desensitizing gel? or a way to make the corona less sensitive? Please help me!