IAM FACING PREMATURE EJACULATION FOR THE PAST 13 YEARS AND I DONT KNOW THE CURSE OF TI.BUT ONE THING I KNOW IS THAT I MASTURBATE FOUR TIMES A WEEK.AND I DONT KNOW IF THE MASTURBATION IS CUSSING THIS.
In a way, yes, it is likely as a result of masturbation. You've probably trained yourself to ejaculate fast. You need to learn control by understanding the feelings as you approach orgasm so that you can "back off."
The idea shouldn't be to just ejaculate but to make your session last as long as possible. You can try this on your own.
There is also counseling that can help. You and your partner would participate. Contact a sex therapist.