Thanks for your query. Based on the fact that you have stated It appears that you have a problem of Premature Ejaculation
.In majority of the cases in absence of any Organic cause like Diabetes ,Hyperthyroidism
it is mind related and due to what is called as Performance anxiety.Following measure will help you to boost up your confidence and delay Ejaculation
1) Practice regular exercise fior 45 minutes followed by meditation
for 1/2 an hour in the morning.
2) Take high protein diet rich in vegetables and fruits and vit A,C,D,E.
3)Take anti oxidants like Almonds 5-6 everyday..
4) Avoid alcohol and smoking.
You should discuss the issue with your wife as her co operation is equally important to solve this problem.
You should consult some Qualified sexologist
to adapt or learn some Techniques like Stop and Start or Squeeze technique to delay ejaculation.Please remember that this can be cure completely. You may take medications like Phosphodiesterase (Sildenafil )and Dapoxetine
to be taken 1/2 hour before going intercourse.Please get prescription of these drugs from your family Physician.