Thanks for your query.Based on the facts that you have posted it appears that you have problem of erectile dysfunction
. You are not getting erection hard enough to penetrate vagina .
Since you are recently married these things do happen with every body in the binning of married life.
In majority of cases an absence of any major health issue this is mind related and due 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.
Please consult qualified sexologist
for clinical evaluation and further treatment.