Physical Cause for Premature Ejaculation

Patient: Dear Sir,1)my age: 27 years(male).if i masturbate now , my penis ejaculate within 3-5 seconds . My penis is strong, healthy. The problem is very short duration of penis. now can i marry ? For your information i am masturbating for school life.2) What type of girl(fatty/slim) will be best for marriage as for my sexual condition?EDIT:3) should i take any MEDICINE?EDIT:3) should i take any MEDICINE?

Symptoms: Nothing