It’s supposed to be sensitive. You’re lucky. Us circumsized guys will never know how natural sex feels because of lost sensitivity from tissue removal, a dried out glans, the brain changing its architecture to ignore stimulus from the penis from clothing, and the excess friction from tight skin making faster speeds a bloody experience.
You can kill nerves though if you really want to. Sensory nerves tend to grow back (assuming the nerve bundle hasn’t been severed or the tissue the nerves would grow to has been cut off). Killing them is very easy. Capsaicin does both, killing and preventing regrowth, to sensory nerves and should work on the penis sensory nerves assuming there isn’t some kind of nerve subtype distinction I’m not thinking of at the moment. I don’t recommend putting that, or any nerve toxin of a functional concentration, on your penis though.
Starting: 7"bplx5.2" 2017 (shrunk from disuse)(originally 8"bplx4.5", gained to 9"bplx6")
Current: 9.0"bplx6.125" 2020
Goal: 11.5"bplx7" 2021.