How to Stop Premature Ejaculation

now i m 19 & had been masturbating since i was 12.my vessels are also loose.what to do?

I’ve been having this problem for a while, this is quite embarassing and i want to stop these problems any way i can. I am still in my late teens, so i don’t think I should be having this problem. Does masturbating alot cause premature ejaculation. If so then how long should i wait to masturbate and how often is normal..also are there anything i can do to keep my penis from losing an errection like diets or exercise, i want to do this without visiting a doctor..