Thanks for your query.Based on the fact that you have posted it appears that you are facing difficulties in penetration and getting premature ejaculation
.are you married recently?In majority of cases it is mind related and ue 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.
5) Spent more time in foreplay.
6) You have to discuss your problem with your wife she will be of much help to resolve this problem.
7) Consult qualified Sexologist
for proper evaluation and to learn few techniques to delay the ejaculation.e.g start and Stop technique or Squeeze technique.
You can take medications lake 5 Phosphodiesterase inhibitors like Sildenafil(Viagra) along with Tab Dapoxetine
to be taken 1 hour before intercourse This will help you in getting hard erection and delaying ejaculation.Do not worry it is the matter of time and be sure that this phase will be over in a short period of time.