thanks for choosing health care magic.Premature ejaculation is not a uncommon problem.There could be various reasons for this and most common are psychological reasons rather physical one.Increase the fore play,use condom this helps in some cases.But most important is remove the anxiety associated with because fear of performance can lead to this.Your partner is the best person who can help with this.You should try different positions which will avoid direct stimulation of glans.Keep trust in your self try yoga and meditation this goes long way in this.Still if problem persists contact your family doctor.