Thanks for your query.Based on the facts that you have posted it appears that you have problem of Erectile Dysfunction
In absence of any major health issue cause of erectile dysfunction is mind related and due to 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..
Use of Sildenafil
(Viagra ) will help you get hard sustainable erection to have sexual enjoyment .
Please get the prescription of drugs from your family physician.