I fro singapore,age 21 n thin..weight 46 and height 169..i have premature ejaculation?

hw to treat it naturally?..where do i can buy the pill at phamarcy?..if i c a doktor,he will give me a medicine to treat it??..wen i fore play wit my gal,he touch my n my semen come up so fast..i try to hold it late by stopping n continue but nvr works..pls help if can my local singapore people..