That's probably frustrating. A couple of questions. Since loss of sensation is often nerve related, have you had any injuries to your penis? Do you have peyonies disease (which is curvature to the penis, could be just forming)? Have you had a physical lately to see if you have any conditions like diabetes? Have you had your testosterone checked? Those are going to be the first things they try to determine. Definitely see your doctor to work on this. https://www.healthline.com/health/numb-penis#outlook