What Is The Cause And Remedy Of This Sexual Problem Of Mine ?

What Is The Cause And Remedy Of This Sexual Problem Of Mine ? 

I do not feel any sensation in my joystick at the time of sex.
I am a 23 year old male. I do not smoke or drink. There is no medical history. My joystick is not circumcised from childhood. The problem which I am facing is that I do not feel any sensation in my joystick glans at the time of sex or while masturbating.
Only a few seconds before ejaculation I feel the sensation in my joystick. I started masturbating 4 months back. I do not have any erectile dysfunction. But still I am not able to enjoy sex due to this problem.

Another thing is that the last time I had a sex drive was before I lost the sensation.

Guys, I need your opinions and advices…..

Thanks

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