Thanks for your query.You are facing problem of Premature ejaculation
.In majority of cases premature ejaculation is mind related and there is no specific organic cause for it.
This is mostly due to performance anxiety
.You have to discuss the issue with your wife she will be of much help to solve your problem.Following measures will help to boost your confidence which is an important aspect in delaying the ejaculation.
1) Take moderate exercise and meditation
for 1/2 hr everyday
2) Take high protein ,fat free diet rich in vegetables and fruits
3) Take anti Oxidants like Almonds 5-6 everyday.
4) Avoid smoking and alcohol.
In addition to this you can take medication like ab Dapoxetine
to be taken 1/2 hr before sex.Hope this will work for you
There is no reason why you can not father a child if your sperm count
and morphology of the sperm is normal .
Assuming that you are getting hard erection there is no question of you being impotent..Please do not worry .