Thanks for your query.Based on the facts that you have posted it appears that you have a problem of premature Ejaculation
. In majority of cases in absence of any organic disease cause of premature ejaculation is mind related and due to what is called as Performance anxiety
Following measure will help you to boost up your confidence and getting good erection.and delay ejaculation.
1) Practice regular exercise for 45 minutes followed by meditation
for 1/2 an hour in the morning.
2) Take high protein diet rich in vegetables and fruits and Vitamin A
3)Take anti oxidants like Almonds 5-6 everyday..
4) Avoid alcohol and smoking..
You mat take medicines like Dapoxetine
to delay ejaculation.