Thanks for your query.
You be stress
free and have healthy diet and positive attitude is important.
First you need to have good relation with your partner that is i terms of talking and to spend more time with him, by outing frequently.
You also do not directly go for penetration, start with foreplay and slowly go for the act.
You can also visit a psychiatrist
, which would be of help for you through the counseling.
Hope I answered your query.
Wishing you good health.