Thanks for your query.Based on the facts that you have posted it appears that you have problem of getting Premature Ejaculation
In majority of cases Premature ejaculation is mind related and due to anxiety
..Following measures will help to boost up your level of confidence and allay anxiety and there by improve your sexual performance,
1) Practice moderate exercise for 45 minutes followed by meditation
for 1/2 hour.
2) Take high protein diet rich in vitamins A,C,E,D.fruits and vegetables .
3) Avoid alcohol and smoking .
4)Take some anti oxidants like Almonds 5-6 everyday.
Discuss this issue with your wife she will be of much help to solve your problem.
Consult qualified sexologist
to learn some techniques to delay ejaculation.
You can take medications like Sildenafil
and Dapoxine after consulting your family Physician.
There are no short cuts in achieving the results it will take 2-3 months time.