Thanks for your query.Based on the facts that you have posted it appears that you have Premature Ejaculation
In majority of patients in absence of any organic disease the cause of premature ejaculation is mind related and due to 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 vit A,C,D,E.
3)Take anti oxidants like Almonds 5-6 everyday..
4) Avoid alcohol and smoking
If you are married or getting indulged in sexual activity with your partner take medications lik 5 phosphodiesterase inhibitors like Sildenaphil and Dapoxine .Consult your family physician for prescription and dosage of the drugs,