Normally young men with tight foreskin, have this problem of very sensitive penis head. This happens because, at all the times, the penis head (aka glans penis) lies within the cover of foreskin. So, it is least exposed to outer atmosphere, hence remains sensitive. This problem can be solved with following techniques.
While masturbating the tip of the penis will be touched and excited. More it is touched, more it gets used to the sensation and over a period of time, it will become lesser sensitive.
2. Retract the foreskin
It is a good habit for all youngsters to slowly try to roll back the foreskin (skin covering the penis head) back over the penis head. You may not succeed at the first attempt, but if you stretch regularly, then things will be better by the day.
3. Treatment for tight foreskin
Get the problem of tight foreskin corrected. Eventually, more exposure of penis head to air will lessen the sensitivity.
Read more about tight foreskin problem and solution
4. While taking bath
Roll back the foreskin as much as you can and run a thin stream of water over the exposed penis head. Over a period of time, this technique will lessen the over-sensitivity. Luke warm water is better than cold / hot water.
5. Apply Ayurvedic Oil
Half an hour before bath, Take Ksheerabala taila (herbal Ayurvedic oil), apply this oil to the tip of the penis and gently try to roll back the foreskin. Apply the oil to the exposed penis head, gently massage the penis head with fingers. This will reduce the sensitivity to a larger extent.
6. While you are at home
Just roll back the foreskin as much as you can and wear the underwear and tolerate the discomfort as far as you can. The exposed part of glans penis is rubbed against the cloth and hence it reduces the sensitivity.
7. Wear a condom
Roll back the foreskin as much as you can and wear a condom. Condom is lot smoother than the cloth hence, it will more easily reduce the very sensitive glans penis.
All in all, very sensitive penis head problem is not a very big issue and will eventually go away with time and practice.