Hello Doctor, I Have Been Masturbating Since The Age Of

Hello doctor,

I have been masturbating since the age of 14 (I am now 26 yrs old), I was able to stay erect for more than 5 minutes.
But recently even if the frequence of masturbation had been reduced, i ejaculated very quickly ( around 38 seconds),can you tell me how to improve this?
It also seems I get aroused too quickly, is my brain getting over stimulated due to my previous frequent ejaculations (4 times a day) during my young age.