Desentization of head of penis

The head of my penis is completely desensitized. But the shaft is still sensitive. It's all about masturbation by rubbing the head of the penis. Ejaculation in sex is still normal - I started to cum in 2 minutes, because barely the shaft gives pleasure. But the feeling of orgasm is very weak. Because of this, sometimes the sex itself is thin. There is only physical work, incomprehensible ejaculation as a release of unnecessary substance in myself.

Please, help with advice. I am 22, and yet no ready to let go of my hands.

 

Not much as several years ago. It's 2-3 times a week, because i haven't left any power and desire to do it. My body and mind is already saturated. The real sex also is not pleasurable, even if its duration is normal